Electrical Connection

The ETHERNET bus module CI521-MODTCP is plugged on the I/O terminal unit TU507-ETH TU507-ETH and TU508-ETH for ETHERNET Communication Interface Modules or TU508-ETH TU507-ETH and TU508-ETH for ETHERNET Communication Interface Modules. Properly seat the module and press until it locks in place. The terminal unit is mounted on a DIN rail or with 2 screws plus the additional accessory for wall mounting (TA526 TA526 - Wall Mounting Accessory).

The electrical connection of the I/O channels is carried out using the 30 terminals of the I/O terminal unit. I/O modules can be replaced without re-wiring the terminal units.

Note

For a detailed description of the mounting, disassembly and electrical connection of the module, please refer to the System Assembly, Construction and Connection chapter AC500 (Standard).

The terminals 1.8 and 2.8 as well as 1.9, 2.9 and 3.9 are electrically interconnected within the terminal unit and have always the same assignment, independent of the inserted module:

Terminals 1.8 and 2.8: Process supply voltage UP = +24 VDC

Terminal 3.8: Process supply voltage UP3 = +24 VDC

Terminals 1.9, 2.9 and 3.9: Process supply voltage ZP = 0 V

Note

With a separate UP3 power supply, the digital outputs can be switched off externally. This way, an emergency-off functionality can be realized.

Note

Do not connect any voltages externally to digital outputs!

Reason: Externally voltages at an output or several outputs may cause that other outputs are supplied through that voltage instead of voltage UP3 (reverse voltage). This ist not intended usage.

Caution

:strong:Risk \ of malfunction by not intended usage!

If the function cut off of the digital outputs should be used by deactivation of the supply voltage UP3, be sure that no external voltage is conncted at the outputs DO0..DO7.

The assignment of the other terminals:

Terminal Signal Description
1.0 AI0+ Plus pole of analog input signal 0
1.1 AI1+ Plus pole of analog input signal 1
1.2 AI2+ Plus pole of analog input signal 2
1.3 AI3+ Plus pole of analog input signal 3
1.4 AI- Minus pole of analog input signals 0 to 3
1.5 AO0+ Plus pole of analog output signal 0
1.6 AO1+ Plus pole of analog output signal 1
1.7 AI- Minus pole of analog output signals 0 and 1
1.8 UP Process voltage UP (24 VDC)
1.9 ZP Process voltage ZP (0 VDC)
2.0 DI0 Signal of the digital input DI0
2.1 DI1 Signal of the digital input DI1
2.2 DI2 Signal of the digital input DI2
2.3 DI3 Signal of the digital input DI3
2.4 DI4 Signal of the digital input DI4
2.5 DI5 Signal of the digital input DI5
2.6 DI6 Signal of the digital input DI6
2.7 DI7 Signal of the digital input DI7
2.8 UP Process voltage UP (24 VDC)
2.9 ZP Process voltage ZP (0 VDC)
3.0 DO0 Signal of the digital output DO0
3.1 DO1 Signal of the digital output DO1
3.2 DO2 Signal of the digital output DO2
3.3 DO3 Signal of the digital output DO3
3.4 DO4 Signal of the digital output DO4
3.5 DO5 Signal of the digital output DO5
3.6 DO6 Signal of the digital output DO6
3.7 DO7 Signal of the digital output DO7
3.8 UP3 Process voltage UP3 (24 VDC)
3.9 ZP Process voltage ZP (0 VDC)

Warning

:strong:Removal/Insertion under power

The devices are not designed for removal or insertion under power. Because of unforeseeable consequences, it is not allowed to plug or unplug devices with the power being ON.

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

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

Disconnecting any powered devices while energized in a hazardous location could result in an electric arc, which could create a flammable ignition resulting in fire or explosion.

Make sure that power is removed and that the area has been thoroughly checked to ensure that flammable materials are not present prior to proceeding.

The devices must not be opened when in operation. The same applies to the network interfaces.

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.

Note

For the open-circuit detection (cut wire), each analog input channel is pulled up to “plus” by a high-resistance resistor. If nothing is connected, the maximum voltage will be read in then.

Note

Generally, analog signals must be laid in shielded cables. The cable shields must be earthed at both sides of the cables. In order to avoid unacceptable potential differences between different parts of the installation, low resistance equipotential bonding conductors must be laid.

Only for simple applications (low electromagnetic disturbances, no high requirement on precision), the shielding can also be omitted.

The following figures show the electrical connection of the ETHERNET bus module CI521-MODTCP.

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Connection of the bus module CI521-MODTCP

Further information is provided in the System Technology chapter CI52x-MODTCP: MODBUS Communication Interface Module