Terminal Units TU551-CS31 and TU552-CS31 for CS31 Bus Modules¶
- TU551-CS31, CS31 Bus Terminal Unit, 24 V DC, Screw-type Terminals
- TU552-CS31, CS31 Bus Terminal Unit, 24 V DC, Spring Terminals
- XC version for usage in extreme ambient conditions available (TU552-CS31 only)
Terminal Unit TU552-CS31, for CS31 Bus Modules (e.g. DC551-CS31)
| Elements of the CS31 Terminal Units | |
|---|---|
| 1 | I/O-Bus (10-pole female) to electrically connect other I/O Terminal Units |
| 2 | Plug (1x 50-pole and 2x 57-pole) to electrically connect the inserted I/O Modules |
| 3 | With a screwdriver inserted in this place, the Terminal Unit and the adjacent I/O Terminal Unit can be shoved from each other |
| 4 | 2 holes for wall mounting |
| 5 | CS31 Bus interface |
| 6 | 30 screw-type or spring terminals for signals and power supply voltage |
| 7 | DIN rail |
| Sign for XC version | |
| Screw-type terminals (TU551-CS31) | Spring terminals (TU552-CS31) | ||||
| Conductor | Screwdriver | Conductor | Screwdriver (opens terminal) |
Figure: Types of terminals
The Terminal Units TU551-CS31 (with screw-type terminals) and TU552-CS31 (with spring terminals) are specifically designed for use with S500 CS31 Bus Modules that incorporate only 24 V DC inputs/outputs or interface signals.
The CS31 Bus Modules plug into the Terminal Unit. When properly seated, they are secured with two mechanical locks. All the electrical connections are made through the Terminal Unit, which allows removal and replacement of the CS31 Bus Modules without disturbing the wiring at the Terminal Unit.
Note
Note: Mounting, disassembling and electrical connection for the Terminal Units and the expansion modules are described in detail in Mounting and disassembling the Terminal Units and the I/O Modules Mounting and Disassembling the Terminal Units and the I/O Modules.
The terminals 1.8 to 4.8 and 1.9 to 4.9 are electrically interconnected within the Terminal Unit and have always the same assignment, independent 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 is dependent on the inserted CS31 Bus Module (see the description of the used CS31 Bus Module).
The supply voltage 24 V DC for the module’s electronic circuitry comes from ZP and UP.
For usage in extreme ambient conditions (e.g. wider temperature and humidity range), a special XC version of the device is available (TU552-CS31 only).