ABB AC500 Series PLC Module Wiring Guide Manual

ABB AC500 Series PLC Module Wiring Guide Manual

The ABB AC500 series PLC module wiring guide focuses on the wiring, installation, and safety specifications of various IO modules in this series of PLCs, covering multiple types of modules such as switch quantity, analog quantity, hybrid module, position module, bus interface module, CPU integrated IO, and communication card. It clarifies the terminal allocation, electrical connection method, power requirements, and anti-interference measures of each module, emphasizes safety points such as power-off operation, correct grounding, and cable selection, and details core concepts such as source/drain type differences and analog wiring system differences, providing comprehensive wiring technical support for PLC system construction.

Document Overview

Basic positioning

The document is a module wiring guide for ABB AC500 series PLC, with the core goal of standardizing the wiring and installation process of various IO modules to ensure stable system operation.

The target audience needs to have basic knowledge of AC500 system and Control Builder Plus/CoDeSys programming, and practical applications need to be adjusted according to the on-site situation.

core principle

Safety priority: All operations must be powered off to avoid overvoltage, short circuit, and grounding circuit risks.

Compatibility: The module supports source/drain input/output, multiple communication protocols, and adapts to different scene requirements.

Anti interference: Reduce the impact of electromagnetic interference through cable selection, wiring specifications, and grounding design.

Core Basic Concepts

（1） Interference processing and wiring

Interference type protection measures

The distance between strong and weak electrical interference is ≥ 20cm (220V/10A or above ≥ 60cm), and weak electrical interference is located below the cable trench

Separate installation of interference PLC and high-voltage electrical appliances inside the cabinet, and separate routing of IO lines and high-power lines in separate slots

RC filter for signal line interference and differential mode interference, differential amplifier+shielded wire for common mode interference

Frequency converter interference, isolation transformer, filter, and output reactor installed nearby

（2） Grounding specifications

Safe grounding: The grounding terminal of the power cord is connected to the cabinet to prevent electric shock and injury.

System grounding: The controller and the controlled equipment have the same potential, and the grounding resistance is ≤ 4 Ω.

Signal grounding: Switching quantities do not require grounding, analog quantities require single point grounding; Shielded wire can be grounded on one side (high-frequency can be grounded on both ends).

Communication grounding: GND grounding for non isolated 485 communication, single point grounding for isolated communication, using shielded twisted pair cables.

（3） Source leakage type and analog line system

Difference between source and drain types

Leakage type (NPN): When the signal is triggered, OUT and GND are conductive, and the COM terminal is connected to the positive pole of the power supply.

Source type (PNP): When the signal is triggered, OUT and VCC are conductive, and the COM terminal is connected to the negative terminal of the power supply.

Analog line system

Two wire system: The power supply and signal share two wires, and the sensor is passive and powered by the module.

Three wire system: Short circuit the power supply negative wire to the signal negative wire, with a power greater than that of the two wire system, and cannot be explosion-proof.

Four wire system: Two wires each for power and signal, active sensors, high measurement accuracy.

Discrimination method: Disassemble the module wires and measure the current with a multimeter. If there is a signal, it is a four wire system; if there is no signal, it is a two wire system.

Core parameters and wiring of various modules

（1） Switching module

Module type represents model, core specifications, wiring points

Input module DI524 32 channel 24V DC terminal 1.8-4.8 connected to UP (24V), 1.9-4.9 connected to ZP (0V)

Output module DO561 8-channel 24V DC transistor (0.5A) external power supply connected to UP/ZP, requiring 3A fast melting protection

Combination module DC522 16 channel configurable IO supports sensor power output (24V DC/0.5A)

（2） Analog quantity module

Core parameters

Resolution: AI523 (12 bits+sign bit), AI531 (15 bits+sign bit), AO561 (11/12 bits).

Support signals: voltage (0-10V, -10~+10V), current (4-20mA, 0-20mA), thermistor (Pt100/Pt1000), thermocouple (J/K/S type).

Wiring requirements

Analog signals require shielded cables, with both ends of the shielding layer grounded.

The three wire system of thermal resistance requires the occupation of two adjacent channels, with the same cross-sectional area of the wires.

Passive sensors are supplied with constant current by modules, while active sensors require independent power supply.

（3） Bus interface and communication card components

Module model, protocol type, core function, bus speed

CI501-PNIO PROFINET 4AI+2AO+8DI+8DO -

CI541-DP PROFIBUS 4AI+2AO+8DI+8DO -

CM572-DP PROFIBUS DP main station communication up to 12MBit/s

CM575-DN DeviceNet main station communication up to 500kBit/s

（4） CPU integrated IO module

Model, Digital Input, Digital Output, Analog Input, Analog Output

PM554 8-way 24V DC 6-way (transistor/relay) --

PM564 6 channels 24V DC (expandable to 8 channels) 6 channels (transistors/relays) 2 channels (0-10V) 1 channel (0-10V/4-20mA)

Safety operation standards

General Requirements

Before all wiring and module replacement operations, the power supply voltage and operating voltage must be turned off.

The module terminal can carry a maximum voltage of 240V AC, and it is necessary to avoid the risk of electric shock. Before operation, confirm that the power is turned off.

protective measures

The IO channel has protection against reverse connection, inversion, short circuit, and continuous overvoltage (up to 30V DC).

The output module does not have built-in short-circuit/overload protection and requires an external 3A (transistor output) or 5A (relay output) fast melting fuse.

Grounding and shielding

The signal line needs to have a unique reference ground to avoid forming a ground loop.

Shielded cables need to be grounded locally or at a single point in the control room in situations where conductive interference may occur.