Electrical connection

The analog input module AI562 can be connected to the following devices via the I/O bus connector:

• S500 bus modules (e. g. CI592-CS31, CI501-PNIO, CI541-DP, CI581-CN)
• AC500 CPUs (PM5xx)
• other AC500 I/O modules

Note

The AI562 must not be used as a decentralized communication interface module at DC505-FBP and CI590-CS31-HA bus modules.

Note

For a detailed description of the mounting, disassembly and electrical connection of the module, please refer to the System Assembly chapter AC500-eCo.

The electrical connection is carried out by using a removable 11-pin terminal block. These terminal blocks differ in their connection system (spring terminals or screw terminals, cable mounting from the front or from the side). TA563-TA565 - Terminal Blocks. The terminal blocks are not included in the module’s scope of delivery and must be ordered separately.

The following block diagram shows the internal construction of the analog inputs:

The assignment of the terminals:

Terminal	Signal	Description
10	O0+	Current source of channel 0
11	I0+	Sense input of channel 0
12	I0-	Return input of channel 0
13	O1+	Current source of channel 1
14	I1+	Sense input of channel 1
15	I1-	Return input of channel 1
16	—	Reserved
17	SG	Signal ground
18	SG	Signal ground
19	UP	Process voltage UP (24 VDC)
20	ZP	Process voltage ZP (0 VDC)

The internal power supply voltage for the module’s circuitry is carried out via the I/O bus (provided by a bus module or a CPU). Thus, the current consumption from 24 VDC power supply at the terminals L+/UP and M/ZP of the CPU/bus module increases by 5 mA per AI562.

The external power supply connection is carried out via the UP (+24 VDC) and the ZP (0 VDC) terminals.

Attention

:strong:Risk of imprecise and faulty measurements!

Analog signals may be distorted seriously by external electromagnetic influences.

Use shielded wires when wiring analog signal sources. The cable shield must be grounded at both ends of the cable. Provide a potential equalisation of a low resistance to avoid high potential differences between different parts of the plant.

Attention

:strong:Risk of damaging the PLC modules!

The PLC modules must not be removed while the plant is connected to a power supply.

Make sure that all voltage sources (supply and process voltage) are switched off before you

• connect or disconnect any signal or terminal block
• remove or replace a module.

Attention

:strong:Risk of damaging the PLC modules!

Overvoltages and short circuits might damage the PLC modules.

• Make sure that all voltage sources (supply and process voltage) are switched off before you begin with operations at the system.
• Never connect any voltages or signals to reserved terminals (marked with —). Reserved terminals may carry internal voltages.

The module provides several diagnosis functions AI562 - Analog Input Module.

The following figures show the electrical connection of RTDs to the inputs of the analog input module AI562.

2-wires input	3-wires input

Note

With 2-wires connection, the resistance of the connection wires influences the accuracy of the measured value. Use 3-wires connection to achieve the guaranteed measuring accuracy.

The meaning of the LEDs is described in the Displays section AI562 - Analog Input Module.