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Connections

For a detailed description of the mounting, disassembly and connection of the module, please refer to the ‎⮫ installation instructions.

The connection is carried out by using a removable 9-pin and 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). The terminal blocks are not included in the module's scope of delivery and must be ordered separately.

Fig. 93: Internal construction of the analog inputs
ILL_2024_AI568_blockdiagram

1

I/O bus interface and MCU core circuit

2

ADC, logic circuit and DC/DC power

3

Analog inputs

4

Functional earth connection

Table 163: Assignment of the terminals

Terminal

Signal

Description

1

I0+

Positive pole of input signal 0

2

I0-

Negative pole of input signal 0

3

I1+

Positive pole of input signal 1

4

I1-

Negative pole of input signal 1

5

I2+

Positive pole of input signal 2

6

I2-

Negative pole of input signal 2

7

I3+

Positive pole of input signal 3

8

I3-

Negative pole of input signal 3

9

---

Reserved

10

I4+

Positive pole of input signal 4

11

I4-

Negative pole of input signal 4

12

I5+

Positive pole of input signal 5

13

I5-

Negative pole of input signal 5

14

I6+

Positive pole of input signal 6

15

I6-

Negative pole of input signal 6

16

I7+

Positive pole of input signal 7

17

I7-

Negative pole of input signal 7

18

SG

Shield grounding

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 communication interface 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/communication interface module increases by 3 mA per AI568.

The external power supply connection is carried out via the UP (+24 V DC) and the ZP (0 V DC) terminals. The ZP terminal is isolated from the M/ZP terminal of the CPU/communication interface module.

NOTICE

NOTICE
NOTICE
NOTICE

NOTICE

NOTICE

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.

NOTICE

NOTICE
NOTICE
NOTICE

NOTICE

NOTICE

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 do the following:

  • Connect or disconnect any signal or terminal block.

  • Remove or replace a module.

NOTICE

NOTICE
NOTICE
NOTICE

NOTICE

NOTICE

Risk of damaging the PLC modules!

Overvoltages and short circuits might damage the PLC modules.

  • Make sure that all voltage sources (supply voltage and process supply voltage) are switched off before you begin with operations on 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.

⮫ “Diagnosis”

The following figure is an example of the internal construction of the analog input AI0. The analog inputs AI1 ... AI7 are designed in the same way.

AI568-01a, 1, --_--
CAUTION

CAUTION
CAUTION
CAUTION

CAUTION

CAUTION

Risk of damaging the analog input!

The 250 W input resistor can be damaged by overcurrent.

Make sure that the current through the resistor never exceeds 30 mA.

Table 164: Example of the connection of analog sensors (voltage) to the input I0 of the analog input module AI568 (Proceed with the inputs I1 ... I7 in the same way)
ILL_2024_AI568_ active connection (voltage)
ILL_2024_AI568_passive connection (voltage)

Connection of active-type analog sensors (voltage)

Connection of passive-type analog sensors (voltage)

Connection of active-type analog sensors (voltage)

Connection of passive-type analog sensors (voltage)

-2.5 V ... 2.5 V

-2.5 V ... 2.5 V

-5 V ... 5 V

-5 V ... 5 V

-10 V ... 10 V

-10 V ... 10 V

0 V ... 5 V

0 V ... 5 V

0 V ... 10 V

0 V ... 10 V
Table 165: Example of the connection of analog sensors (current) to the Input I0 of the analog input module AI568 (Proceed with the inputs I1 ... I7 in the same way.)
Fig. 94: ILL_2024_AI568_ active connection (current)
ILL_2024_AI568_ active connection (current)
Fig. 95: ILL_2024_AI568_ passive connection (current)
ILL_2024_AI568_ passive connection (current)

Connection of active-type analog sensors (current)

Connection of passive-type analog sensors (current)

Connection of active-type analog sensors (current)

Connection of passive-type analog sensors (current)

4 mA ... 20 mA

4 mA ... 20 mA

0 mA ... 20 mA
Table 166: Example of the connection of NTC to the Input I0 of the analog input module AI568 (Proceed with the inputs I1 ... I7 in the same way.)
ILL_2024_AI568_ NTC connection (current)

Connection of NTC

803 Ω ... 100 kΩ

⮫ Meaning of the LEDs