TU551-CS31 and TU552-CS31 for CS31 Communication Interface Modules

  • TU551-CS31, CS31 bus terminal unit, 24 V DC, screw terminals
  • TU552-CS31, CS31 bus terminal unit, 24 V DC, spring terminals
  • XC version for use in extreme ambient conditions available (TU552-CS31 only)
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The CS31 communication interface modules plug into the terminal unit. When properly plugged-in, they are secured with two mechanical locks. All the electrical connections are established via the terminal unit, which allows removal and replacement of the CS31 communication interface modules without disturbing the wiring at the terminal unit.

The Terminal Units TU551-CS31 and TU552-CS31 are specifically designed for use with S500 CS31 communication interface modules that incorporate only 24 V DC inputs/outputs or interface signals.

Screw terminals Spring terminals
Conductor ../_images/cb0f5afaa8bcdff30a3313903f4b6c2f Screwdriver Conductor ../_images/9660db05a8bdfbeb0a3313906e759f77 Screwdriver (opens terminal)

Note

For a detailed description of the mounting, disassembly and electrical connection of the terminal units and the I/O modules, please refer to the “System Assembly, Construction and Connection” chapter AC500 (Standard).

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 V DC
  • Terminals 1.9 to 4.9: process voltage ZP = 0 V

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

The supply voltage of 24 V DC for the module’s circuitry comes from ZP and UP.