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).

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 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.

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.

The assignment of the other terminals:

Terminal Signal Description
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

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.

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.

Attention

:strong:Risk of faulty measurements!

The negative pole/earthing potential at the sensors must not have too large a potential difference with respect to ZP (max. ± 1 V within the full signal range).

Make sure that the potential difference never exceeds ± 1 V.

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 CI511-ETHCAT.

The measuring ranges are described in the section Measuring Ranges CI511-ETHCAT CI511-ETHCAT.

The function of the LEDs is described in the section Status LEDs CI511-ETHCAT.