Siemens AS-i SlimLine Diagnostic Guidelines

This design allows the entire cabinet to be connected to only the AS-i cable and 24V auxiliary power supply at the first connector, and subsequent modules will automatically receive power and communication, greatly saving wiring time.

2.3 Wall Installation

For chassis without rails, push in fixing ears (3ZY1311-0AA00) can be used to secure the module. Insert the fixed ear into the reserved slot on the side of the module, and then tighten it with an M4 × 12 screw through the long hole of the fixed ear (torque<0.1Nm for the upper part and 1Nm for the lower part). If installing the device connector on the wall, the connector needs to be fixed to the wall with screws first, and then the module needs to be fastened.

2.4 Terminal Types and Wiring Rules

The module provides two types of detachable terminals: screw terminals (recommended torque 0.6~0.8Nm, PZ1 screwdriver) and push in spring terminals. For spring terminals, hard wires or wires with cold pressed ends can be directly inserted into circular holes; Thin multi strand wire needs to be pressed into the rectangular hole with a 3mm flat screwdriver to open the spring, and then inserted into the wire. The recommended cross-sectional area of the wire is 0.5-1.5mm ² (AWG 20-16). The terminal positions are numbered, and the corresponding terminal function identification is printed on the inner side of the upper and lower cover plates to prevent incorrect wiring during module replacement.

Addressing and System Integration

Each AS-i slave must have a unique address (1-31 or 1A~31B). The SlimLine Compact module is connected to addressing devices (such as AS-i Handheld) through the "ADDR" circular hole on the front panel.

Non A/B slave stations (some models starting with 3RK1) occupy a standard address, ranging from 1 to 31.

A/B slaves (starting with 3RK2) support extended address mode, and the same physical address can accommodate two slaves, A and B, with a maximum of 62 slaves. The manual recommends using only address A or B for faster transmission.

When addressing, insert the connection line of the addressing device into the ADDR socket, and the module will temporarily disconnect from the AS-i bus. After writing the address according to the operating instructions of the addressing device, simply unplug it. The new module has a factory address of "0" and must be assigned a valid address to be recognized by the main station.

In depth Digital Module: Sensor Power Supply and Output Characteristics

4.1 Sensor Power Supply Selection

For digital modules that support AS-i/AUX switching, there is a dip switch on the back: when in position "AS-i", the sensor power is taken from AS-i voltage (about 30V DC), providing a maximum total current of 200mA (40 ° C environment); When in position "Uaux", it is taken from a 24V auxiliary power supply and provides a maximum total current of 500mA. This design allows high-power sensors (such as photoelectric switches) to be powered by Uaux, avoiding AS-i voltage drops.

No matter which power supply is chosen, the sensor wiring method remains unchanged: connected to the I+and I - terminals. If the sensor is a 2-wire system, it should be connected in series between I+and I -; In the 3-wire system, I+represents positive power supply, I - represents negative power supply, and the signal line is connected to INx.

4.2 Input electrical specifications

The digital input complies with the PNP Type 2 standard (EN 61131-2). High level threshold ≥ 10V, input current ≥ 6mA; low level ≤ 1.5mA. Therefore, NPN sensors cannot be directly connected and external relays or converters are required.

4.3 Output protection and fault indication

The transistor output (DQx) has overload detection function. When a channel is overloaded, the LED of that channel turns red, and the AS-i master station can read the I/O fault bit (only supported by A/B slave stations). The relay output (RQx) does not have overload detection, but can be protected by external fuses.

When communication is interrupted (such as when the main station is offline), the output will reset after 40-100ms (cycle time monitoring). The standard output of the ASIsafe module is also reset when safety communication is interrupted.

Special requirements for ASIsafe module

The safety input F-INx must be connected to mechanical contacts and cannot be connected to semiconductor output sensors. Each safety input has two wires: F-INx and GND. The module will undergo pulse testing and short circuit detection internally to achieve a safe circuit.

For 3RK1405-2Bx00, the standard outputs (DQ0, DQ1) can be selected from AS-i or Uaux power sources through another back dip switch. If AS-i is used for power supply, output overload will cause the entire module to shut down communication (FAULT LED red); If Uaux is used for power supply, overload only causes the corresponding output LED to turn red, without affecting communication.

The safety module does not transmit I/O fault bits, and diagnosis relies entirely on LED indications.

Analog module configuration and accuracy

6.1 Input module wiring differences

Current measurement: For 2-wire sensors, the sensor power supply needs to be connected between Lx+and Mx, and AIx+and AIx - short circuited; The 4-wire system is connected to AIx+and AIx - respectively.