Electrical Connection

The CS31 bus module is plugged on the CS31 terminal unit TU551 or TU552 TU551-CS31 and TU552-CS31 for CS31 Communication Interface Modules. Hereby, it clicks in with two mechanical locks. 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 40 terminals of the CS31 terminal unit. It is possible, to replace CS31 bus modules and I/O modules without loosening the wiring.

The terminals 1.8 to 4.8 and 1.9 to 4.9 are electrically interconnected within the CS31 bus terminal unit and have always the same assignment, independent of the inserted module:

Terminals 1.8 to 4.8: Process voltage UP = +24 VDC

Terminals 1.9 to 4.9: Process voltage ZP = 0 V

The terminals 1.8 to 4.8 and 1.9 to 4.9 are electrically interconnected within the terminal unit and always have the same assignment, irrespective of the inserted module:

  • Terminals 1.8 to 4.8: process voltage UP = +24 VDC
  • Terminals 1.9 to 4.9: process voltage ZP = 0 V

The assignment of the other terminals depends on the inserted CS31 bus module.

Assignment of the other terminals:

Terminals Signal Description
1.0 to 1.7 RS-485 CS31 bus interface
2.0 to 2.7 I0 to I7 8 digital inputs
3.0 to 4.7 C8 to C23 16 digital inputs/outputs

The supply voltage 24 VDC for the module’s electronic circuitry comes from the ZP/UP terminals.

The module provides several diagnosis functions DC551-CS31 - Digital Inputs and Output).

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.

The following figure shows the electrical connection of the CS31 bus module DC551-CS31.

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Caution

:strong:Risk of influences to the connected sensors!

Some sensors may be influenced by the deactivated module outputs of DC551-CS31.

Connect a 470 W / 1 W resistor in series to inputs C16/C17 if using them as Fast Counter inputs to safely avoid any influences.