SCHNEIDER TSX Premium System Operation and Maintenance

Complete guide for on-site selection, installation, and troubleshooting of SCHNEIDER TSX Premium series (TSX P57-10/P57-20 processors and TSX DEY/DSY I/O modules)

In the field of industrial automation, Schneider Electric's Modicon TSX Premium platform has long served process control, infrastructure, and manufacturing industries with its high reliability, modular design, and powerful distributed processing capabilities. Among them, the TSX P57 series processors (P57-10 and P57-20) and the TSX DEY (input)/DSY (output) discrete I/O modules constitute the system core. Although Schneider has launched a new generation of controllers in recent years, a large number of existing production lines, water treatment stations, and packaging equipment are still running these classic modules. For on-site maintenance engineers, quickly mastering processor parameter configuration, I/O module characteristics, and identifying and troubleshooting common faults are key skills in reducing unplanned downtime. This article is based on the TSX Premium Quick Reference Guide (covering technical data in multiple language versions), which systematically outlines the practical knowledge of the entire process from processor selection, I/O module selection, installation and wiring, and fault diagnosis.

Detailed explanation of TSX P57-10 and TSX P57-20 processors

2.1 Capacity and scalability

The TSX Premium rack is connected via Bus X bus, and the processor is located in a specific slot of the rack (depending on the type of power module). The core difference between the two models lies in:

Characteristics TSX P57-10 TSX P57-20

Maximum number of racks (TSX RKY. E.) 2 x 8

The maximum number of I/O points is 512 discrete points, 24 analog signals are 1024 discrete points, and 80 analog signals are available

The maximum number of dedicated modules (counting, axis control, stepper, communication, weighing) is 2 and the maximum is 6

Internal RAM 32 kW 48 kW

PCMCIA memory expansion support (up to 96 Kwords) support (up to 176 Kwords)

1000 instruction execution time (RAM) 1.39 ms 0.78 ms

Programming software PL7 Junior (Windows) PL7 Junior (Windows)

Selection suggestion: If the on-site cabinet space is limited and the control scale does not exceed 512 points, P57-10 is economical and efficient; For production lines with multiple slave stations and high-speed processing requirements, P57-20 provides faster scanning cycles and larger application memory.

2.2 Built in interfaces and communication

The front panel of the processor provides:

TER port: 8-pin mini DIN (RS485 non isolated), default UNI-TELWAY master station, 19200 baud. It can be connected to programming terminals (such as FTX 117) or connected to UNI-TELWAY bus through TSX P ACC 01 isolation box. This port can output 5V power and is used for portable programmers.

AUX port: also an 8-pin mini DIN, used to connect to human-machine interface (HMI) or printer, but does not provide 5V power supply. Can be configured as UNI-TELWAY slave or ASCII character mode.

PCMCIA Type 3 communication card slot: Supports TSX SCP 111 (RS232 multi protocol), TSX SCP 112 (20mA current loop), TSX SCP 114 (RS485/422 isolation), and TSX FPP 10/20 (FIPIO Agent or FIPWAY). Important: Before plugging or unplugging the communication card, the processor power must be cut off, otherwise it may damage the card or cause system failure.

2.3 Memory backup and real-time clock

The internal RAM can be powered off and maintained through the optional battery (TSX PLP 01) on the power module. Please note: The battery is only effective when the processor and power module remain installed in the rack. Removing the processor will result in the loss of real-time clock and timestamp information. After shutdown, if the battery fails, the program and data will be lost. Therefore, it is recommended to replace the battery every 2-3 years.

2.4 RESET button and cold start

The pencil tip reset button on the front panel is used to force a cold start:

Press during normal operation: Depending on the configuration, it can be restarted to STOP or RUN state.

Fault status press: Force start in STOP mode. Attention: This operation will not clear the user program, but will reinitialize all data areas, which may cause production interruption and should be used with caution.

TSX DEY Discrete Input Module: Selection and Characteristics

The input module is used to connect on-site devices such as buttons, limit switches, proximity sensors, etc. According to the signal type and voltage level, it is mainly divided into two categories: DC input and AC input.

3.1 DC input module (24V/48V)

Model number, point connection method, rated voltage, input current (typical), filtering time in accordance with IEC 1131 type

TSX DEY 08D2 8-terminal block 24V DC 7mA 4ms Type 2

TSX DEY 16D2 16 terminal block 24V DC 7mA 4ms Type 2

TSX DEY 16D3 16 terminal block 48V DC 7mA 4ms Type 2

TSX DEY 16FK 16 HE10 connector 24V DC 3.5mA 0.1~7.5ms programmable Type 1

TSX DEY 32D2K 32 HE10 24V DC 3.5mA 4ms Type 1

TSX DEY 64D2K 64 HE10 24V DC 3.5mA 4ms Type 1

Key features:

Constant current input: 24V/48V DC input is a "current generation source" type. When the input voltage exceeds 11V (24V) or 20V (48V), the input current remains constant and is not affected by voltage fluctuations. This improves the tolerance to voltage drop in long cables.

2/3 line proximity switch compatible: Complies with CENELEC or Telemecanique standards and can be directly connected to PNP or NPN sensors.

Programmable filtering (DEY 16FK only): The filtering time can be adjusted within 0-7.5ms. For mechanical contacts (travel switches), it is recommended to set ≥ 3ms to eliminate bouncing; For electronic sensors, a shorter value (such as 0.5ms) can be set to improve response speed.

Event Capture (DEY 16FK): Up to 16 inputs can be configured as event inputs, triggering CPU interrupts when signals change, achieving microsecond level response. It is required that the interval between two consecutive pulses be at least two PLC scanning cycles, with a pulse width greater than the filtering time.

State latch (DEY 16FK): capable of capturing pulses shorter than the scanning period, ensuring that signals are not lost.

3.2 Communication input module (24V/48V/115V/230V)

Model Number Rated Voltage Frequency Input Impedance Typical Current

DEY 16A2 16 24V AC 47-63Hz 1.6kΩ 15mA

DEY 16A3 16 48V AC 47-63Hz 3.2kΩ 16mA

DEY 16A4 16 115V AC 47-63Hz 9.2kΩ 12mA

DEY 16A5 16 230V AC 47-63Hz 20kΩ 15mA

The communication module is suitable for long-distance transmission or scenarios compatible with existing AC devices. Note that its response time is limited by 50/60Hz rectification filtering and is usually slower than DC modules.

TSX DSY Discrete Output Module: Types and Protection Mechanisms

The output module drives actuators such as relays, solenoid valves, indicator lights, etc. It is divided into three types: transistors, relays, and three terminal bidirectional thyristors (Triac).

4.1 DC transistor output (24V/48V)

Number of model points per channel Current module Total current Short circuit/overload protection Response time

DSY 08T2 8 0.5A 4A/7A with (electronic) 1.2ms

DSY 08T22 8 2A 14A has 0.2ms

DSY 08T31 8 1A 7A has 0.3ms

DSY 16T2 16 0.5A 4A/7A (per common end) has 1.2ms

DSY 16T3 16 0.25A 4A has 1.2ms

DSY 32T2K 32 0.1A 3.2A has 1.2ms

DSY 64T2K 64 0.1A 5A has 1.2ms

Protection and Recovery:

The transistor outputs are equipped with built-in short-circuit and overload detection. When a fault is detected, the corresponding channel automatically disconnects (trips), the channel indicator light flashes, and the PLC's I/O red light lights up.

Output reactivation: Can be configured to automatically reactivate (attempted every 10 seconds) or manually reactivate through a program/terminal. Re activation is performed in groups (8 channels per group), with a minimum interval of 10 seconds between two re activations. Only when the fault disappears can reactivation be successful.

Pre actuator voltage monitoring: If the pre actuator supply voltage is below the threshold (16V for 24V modules and 34V for 48V modules), the system will report a fault and optionally shut down the output.

Fallback state: In the event of a serious failure (such as an internal module error), the output can be configured to remain in the last state, fallback to 0, or fallback to 1.

4.2 Relay output (50VA/100VA)

Model Point AC Capacity DC Capacity Switch Life (Typical) Fuse Protection

DSY 08R5/16R5 8/16 24-240V AC, 3A (50VA) 12-24V DC, 3A (24W) 1 × 10 ⁶ times none, external required

DSY 08R4D 8 is not suitable for 24-130V DC, 5A (100VA) 1 × 10 ⁶ times available (replaceable)

DSY 08R5A 8 24-240V AC, 5A 24-48V DC, 5A 1 × 10 times available (replaceable)

Points to note:

The relay output does not have built-in short-circuit protection, and a fuse or circuit breaker must be installed on the external circuit.

For inductive loads (motors, solenoid valves), it is necessary to connect an RC absorption circuit (AC) or a freewheeling diode (DC), otherwise the contact life will sharply decrease.

When the terminal block is unlocked, the relay output will automatically cut off to ensure safe replacement of the load.

4.3 Three terminal bidirectional thyristor output (Triac)

DSY 08S5: 8-point, 48-240V AC, 2A/point, 12A/module

DSY 16S4: 16 o'clock, 24-120V AC, 1A/point, 12A/module

Triac output is suitable for AC resistive loads with frequent switching, such as heaters and lighting. Its characteristics are silence and no mechanical wear, but there is leakage current (about several milliamps), which is not suitable for driving small current loads (such as LED indicator lights), otherwise it will flicker.

Practical Specification for Installation and Wiring

5.1 Processor and I/O Module Installation

Rack position: When using standard power modules (TSX PSY 1610/2600), the processor must be plugged into slot 00; When using a dual format power supply (TSX PSY 3610/5500/5520), the processor is plugged into slot 01. Before installing the module, the power supply to the rack must be cut off.

Hot swappable: I/O modules can be plugged in and out of the rack without power (but the power supply to the on-site sensors and actuators needs to be cut off), while processor modules are not allowed to be plugged in and out with power on.

5.2 Terminal Blocks and Connectors

Terminal block module: equipped with detachable screw terminal blocks (such as TSX BLY 01 ordered separately). Each terminal can accommodate wires ranging from 0.2mm ² (AWG24) to 1.5mm ² (with end caps) or 2mm ² (bare wire). The terminal block is equipped with identification plates that can record module addresses and channel symbols.

HE10 connector module: Use 20 core flat cables or pre fabricated bundled cables. Multiple lengths available: TSX CDP 301 (3m), 501 (5m) for direct connection; And fine core cables (0.08mm ², suitable for TELEFAST 2 interface, current ≤ 100mA) or 0.34mm ² cables (≤ 500mA).

5.3 External Power Supply and Wiring

Sensor power supply: It is recommended to use an independent 24V DC power supply, which is protected by a 0.5A fast fuse. The sensor power supply voltage must be maintained within the tolerance of the rated value (19-30V). If the on-site 24V does not meet the TBTS standard, the 0V terminal must be connected to the protective ground.

Pre actuator power supply: also requires fast fuse protection. For high current output, it is recommended to install separate fuses at each common terminal and select wires with sufficient cross-sectional area.

Cable separation: To avoid AC coupling noise, power cables (power supply, contactors) must be routed separately from I/O signal cables, with a minimum spacing of 200mm. The use of shielded cables can further suppress interference.

5.4 Sensor Voltage and Terminal Block Monitoring

Sensor voltage monitoring: All input modules continuously monitor the sensor supply voltage. When the voltage is below the threshold, the module reports a fault (I/O indicator light is always on). This is the first step in troubleshooting the issue of 'input points not changing'.

Terminal block monitoring: All terminal block I/O modules are equipped with micro switches to check if the terminal block is properly locked. If the terminal block is missing or loose, the module reports a "terminal block fault" (I/O indicator light flashes). Be sure to confirm that the terminal block is fully inserted after repair.

Practical diagnosis and troubleshooting

6.1 Meaning of processor LED indicator lights

Meaning of LED color status

RUN green constant light, PLC running normally

RUN green flashing PLC in STOP state

RUN green goes out, PLC fault, no program, or program is invalid

ERR red constant module failure, system or power failure

ERR red flashing application error, PCMCIA memory card or communication card malfunction

I/O red constantly on, I/O configuration error or module failure

TER port is communicating with the yellow constantly lit TER port

Common handling: If ERR flashes, check if the application has been zeroed or if the range has exceeded the limit; If the I/O is constantly on, reconfigure the rack and check if all I/O module models match the actual ones.

6.2 Troubleshooting of Input Module

Fault phenomenon: The channel indicator light is not on, but the on-site sensor has been activated.

Possible reasons:

Sensor power loss or low voltage (below 19V).

The input point filtering time is set too high, while the sensor pulse width is smaller than the filtering time (especially for DEY 16FK programmable filtering).

The leakage current of the 2-wire proximity switch is large, causing the input to fail to reset to 0. At this point, a 1k Ω resistor needs to be connected in parallel.

Diagnostic steps:

Measure the voltage on the module terminals: 24V DC input should be ≥ 11V in state 1 and ≤ 5V in state 0. If the voltage is normal but the indicator light does not light up, it may be due to internal optocoupler damage.

View the "sensor supply fault" position in the module status word through PL7 Junior software.

6.3 Short circuit tripping recovery of output module

Phenomenon: A certain output point indicator is flashing, and the I/O red light is constantly on.

Reason: Short circuit or overload of the output channel triggers electronic protection.

Recovery process:

Disconnect the power supply of the on-site actuator and check if there is a short circuit or overcurrent in the load.

If configured for automatic reactivation, the module will automatically attempt to recover after 10 seconds; If the fault has been resolved, the output will return to normal.

If configured for manual reactivation, the system bit (such as% S50) needs to be called through the PLC program or the "Reset I/O" command needs to be executed through the programming terminal.

If the circuit trips again after reactivation, it indicates that the load fault has not been resolved or the channel has been damaged (the module needs to be replaced).

Attention: The relay output module has no electronic protection, and short circuits can burn out contacts or even PCB wiring. It is necessary to install fuses externally.

6.4 Abnormal output rollback status

Phenomenon: After the PLC shuts down, some outputs still remain at 1, causing the actuator to not disconnect.

Reason: "Fallback" is set to "Keep State" in the module configuration. When the PLC enters STOP or malfunctions, the rollback setting determines the output behavior. For safety related loads (such as valves for emergency stop control), they should be configured to 'roll back to 0'.

Modification method: On the hardware configuration page of PL7 Junior, select the corresponding output module and set it to "0" in the "Fallback" tab.

6.5 Communication Failure: TER Port Cannot Connect to Programmer

Phenomenon: timeout when uploading program on PC.

Possible reasons:

Cable wiring error (TER port is 8-pin mini DIN, requires dedicated adapter TSX PCX 1131 or TSX P ACC 01).

The port is occupied (for example, AUX is also connected to a device, and the two addresses conflict).

The port configuration has been modified to non UNI-TELWAY master mode.

Solution steps:

Check if the TER port provides 5V power supply (measurement pins 1 and 5). If there is no 5V, it may be due to damage to the internal power supply of the CPU.

Use an RS485 to USB converter to ensure correct+and - polarity.

Restore the default baud rate of 19200 through a cold start (reset button) (note that it will clear the current configuration? In fact, resetting does not change the configuration and needs to be restored through PL7's "Factory Settings").

Suggestions for system upgrade and data backup

7.1 PCMCIA Memory Card Usage

TSX Premium supports PCMCIA Type 1 memory cards:

SRAM card (such as TSX MRP 032/064): used for program development and debugging, with battery backup.

FLASH EPROM card: solidify the final program to prevent modification.

Backup card: used to load programs into internal RAM without programming terminals (programs on the card must be ≤ 32Kwords).

Operation reminder: The memory card can be plugged in and out when the CPU is powered on (which may cause a cold start). To ensure safety, it is recommended to perform power-off operation. Before removing the memory card, execute 'Disable backup' through PL7.

7.2 Considerations for Old System Migration

For replacement projects of early TSX 17/47 series or Modicon 984, upgrading to TSX Premium can retain most of the I/O wiring (requiring adapter replacement). P57-20 supports FIPWAY communication and is compatible with existing remote I/O stations. Programming languages (ladder diagrams, lists, structured text, Grafcet/SFC) make program porting relatively smooth.