Electrical Connection

The electrical connection of the I/O channels is carried out using the 40 terminals of the I/O terminal unit. I/O modules can be replaced without re-wiring the terminal units.

The terminals 1.8 to 4.8 and 1.9 to 4.9 are electrically interconnected within the I/O 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:

Terminals Signal Description
1.0 to 1.3 +24 V 4 x sensor power supply sources (loadable with 0.5 A in total)
1.4 to 1.7 0 V 0 V (reference potential)
2.0 to 2.7 C0 to C7 8 digital inputs/outputs
3.0 to 3.3 +24 V 4 x sensor power supply sources (loadable with 0.5 A in total)
3.4 to 3.7 0 V 0 V (reference potential)
4.0 to 4.7 C8 to C15 8 digital inputs/outputs

The internal power supply voltage for the module’s circuitry is carried out via the I/O bus (provided by a bus module or a CPU). Thus, the current consumption from 24 VDC power supply at the terminals L+/UP and M/ZP of the CPU/bus module increases by 2 mA per DC522.

The external power supply connection is carried out via the UP (+24 VDC) and the ZP (0 VDC) terminals.

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.

Attention

:strong:Risk of influences to the connected sensors!

Some sensors may be influenced by the deactivated module outputs of DC522.

Connect a 470 W / 1 W resistor in series to inputs C8/C9 if they are used as fast counter inputs to avoid any influences.

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Electrical connection of the module

The modules provide several diagnosis functions DC522 - Digital Input/Output Module.