Allen Bradley 1753 Series GuardPLC 1800 Controller

Current characteristics: The maximum current consumption of the controller is 9A (including I/O load), and it requires 1A for its own operation. The remaining 8A can be used to power input/output devices.

Digital input wiring (24 channels, divided into 3 groups, with 8 channels per group)

Power supply and circuit: Each set of inputs is powered by an independent LS+(24V DC sensor power supply with short-circuit protection), and the input signal is referenced to L - (common terminal); Supports dry contact input or sensors with independent power supply (such as safety light curtains), and the negative pole of the external power supply needs to be connected to the controller L.

Safety design: Following the "closed circuit principle", the input signal is reset to "0" by default in case of a fault (power-off safety state); If an input fault (such as a short circuit) is detected, the input signal of the fault channel is forced to be "0", and the FAILT indicator light is activated.

Terminal specifications: The terminal supports 0.13-1.3mm ² (26-16 AWG) wires, with a tightening torque of 0.51N · m (4.5 lb · in). Terminals 11-20, 21-30, and 31-40 correspond to three sets of input LS+, input channel, and L-。

Digital output wiring (8 channels)

Load capacity:

At channels 1-3 and 5-7, the maximum current per channel is 0.5A at 60 ° C;

Channels 4 and 8 (heavy-duty channels): 1A/channel at 60 ° C, 2A/channel at 50 ° C;

The total output current is ≤ 7A, with a minimum load of 2mA per channel. When overcurrent occurs, the output is turned off and automatically restored after troubleshooting.

Wiring requirements: The output circuit should use L - (terminal 1/10) of the corresponding group as the common terminal. Even if L - is internally connected, it is still recommended to use it according to the group (EMC test verification configuration); It is recommended to parallel 1N4004 diodes to suppress interference voltage for inductive loads.

Safety feature: In the event of a fault, all outputs are forced to shut down (in a power-off safety state), and there is no monitoring of the external circuit. However, a short circuit will trigger a fault indication.

Analog input wiring (8 channels, single polarity)

Signal type:

Voltage signal: 0~10V DC (requires an external 10k Ω shunt resistor);

Current signal: 0~20mA (requires an external 500 Ω shunt resistor);

Unused analog inputs need to be short circuited (connected to I and L -) to avoid interference.

Wiring specifications: Use shielded twisted pair cables, with both ends of the shielding layer grounded, and a maximum wiring length of 300m (984 feet); Terminals 41-64 correspond to transmitter power supply (T1-T8), signal input (I1-I8), and reference terminal (L -) with 8 inputs, supporting 0.13-1.3mm ² (26-16 AWG) wires.

High speed counter wiring (2 channels, 24 bits)

Function configuration: Each counter includes three terminals: A (counting input), B (direction input), and Z (reset input). It supports 5V/24V DC signals and has a maximum input frequency of 100kHz. It can be used as a counter or a 3-digit Gray code decoder.

Wiring requirements: Use shielded twisted pair cables, with both ends of the shielding layer grounded, and a maximum wiring length of 500m (1640 feet); Terminals 65-72 correspond to A1/B1/Z1/L - and A2/B2/Z2/L - of the 2-channel counter, and unused inputs do not need to be terminated.

（4） Communication connection: Separation of secure and non secure

Secure Communication (GuardPLC Ethernet)

Interface configuration: 4 RJ45 interfaces (top 2+bottom 2), connected internally through an Ethernet switch, supporting automatic negotiation (full/half duplex, 10/100Mbps), can use direct or crossover Ethernet cables, supporting star/line topology (network loops are prohibited).

Application scenario: Connect distributed security I/O, other GuardPLC controllers, OPC servers (requiring 1753-OPC modules) and programming software, with MAC address attached to the bottom RJ45 interface.

Non secure communication (3-channel 9-pin D-shell interface)

Interface function:

COMM1：RS-485， Supports Modbus slave (1753-L32BBBM-8A) or Profibus DP slave (1753-L32BBBP-8A);

COMM2: Reserved (TBD);

COMM3：RS-485， Support GuardPLC ASCII protocol;

Pin definitions: Pin 3 (RxD/TxD-A) and Pin 8 (RxD/TxD-B) are for data transmission and reception, Pin 5 (DGND) is for data ground, Pin 6 (VP) is for 5V power supply, and Pin 4/9 are for control signals.

Default parameters: IP address defaults to 192.168.0.99, system ID (SRS) defaults to 60000, and custom parameters can be recorded through transparent labels (note not to obstruct ventilation holes).

（5） Fault diagnosis and status indication

Reset button operation

Trigger scenario: When forgetting the online password for programming software and unable to obtain IP address/SRS, use an insulated needle to press the reset button (top received hole, 4-5cm from the left edge).

Reset process: Press and hold the button for 20 seconds, while restarting the controller (power off and then on). After resetting, only the default account is retained, and the IP address/SRS is restored to its default value; Restore the parameters modified before or after resetting during the next power on (depending on whether they have been modified).