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 remote expansion module at DC505-FBP and CI590-CS31-HA Bus Modules.

Note

Mounting, disassembling and electrical connection for the I/O Modules are described in detail in the S500 System Data S500 System Data, Overviewchapters.

The electrical connection is carried out by using a removable 11-pole Terminal Block. These terminal blocks differ in their connection system (spring terminals or screw-type terminals, cable mounting from the front or from the side). TA563-TA565 Terminal Blocks for AC500-eCo I/O Modules and AC500-eCo \ CPUs. 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	Meaning
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 V DC)
20	ZP	Process voltage ZP (0 V DC)

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 V DC 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 V DC) and the ZP (0 V DC) terminals.

Caution

: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.

Caution

:strong:Risk of damaging the PLC modules!

The PLC modules must not be removed when the plant is powered on.

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

• connecting or disconnecting any signal or terminal block
• removing or replacing a module.

Caution

:strong:Risk of damaging the PLC modules!

The PLC modules can be damaged by overvoltages and short circuits.

• Make sure that all voltage sources (supply and process voltage) are switched off before you are beginning 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 Analog Input Module AI562.

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 Displays Analog Input Module AI562.