Electrical Connection

The Ethernet Bus Module CI511-ETHCAT is plugged on the I/O Terminal Unit TU507-ETH or TU508-ETH. 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).

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

Mounting, disassembling and electrical connection for the Terminal Units and the I/O modules are described in detail in S500 System Data AC500 System Data and System Construction.

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 V DC

Terminal 3.8: Process supply voltage UP3 = +24 V DC

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. With this, an emergency-off functionality can be realised.

The assignment of the other terminals:

Terminal Signal Meaning
1.0 to 1.3 AI0 to AI3 Plus poles of the 4 analog inputs
1.4 AI- Minus pole of the analog inputs
1.5 to 1.6 AO0 to AO1 Plus poles of the 2 analog outputs
1.7 AO- Minus pole of the analog outputs
2.0 to 2.7 DI0 to DI7 8 digital inputs
3.0 to 3.7 DO0 to DO7 8 digital outputs

Caution

Removal and mounting of energized modules is not permitted. All power sources (supply and process voltages) must be switched off while working on any AC500 system.

Caution

There is no electrical isolation between the analog circuitry and ZP/UP. Therefore, the analog sensors must be electrically isolated in order to avoid loops via the earth potential or the supply voltage.

Caution

Because of their common reference potential, analog current inputs cannot be circuited in series, neither within the module nor with channels of other modules.

Note

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

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

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

The following figures show the electrical connection of the Ethernet Bus Module CI511-ETHCAT.

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Connection of the Bus Module CI511-ETHCAT

Note

In case of voltage feedback, 2 cases are distinguished:

1. The outputs are already active

The output group will be switched off. A diagnosis message will appear. After 5 seconds, the module tries automatic reactivation.

2. The outputs are not active

Only the output with voltage feedback will not be set to active. A diagnosis message will appear.

Caution

The earthing potential at the sensors must not have a too big potential difference with respect to ZP (max. ± 1 V within the full signal range). Otherwise problems can occur concerning the common-mode input voltages of the involved analog inputs.

Caution

Caution: The process supply voltage must be included within the earthing concept of the plant (e. g. earthing of the minus pole).

The module provide several diagnosis functions EtherCATâ Bus Module CI511-ETHCAT.