I/O Terminal Units TU515 and TU516 for I/O Expansion Modules¶
- TU515, I/O Terminal Unit, 24 V DC, Screw-type Terminals
- TU516, I/O Terminal Unit, 24 V DC, Spring Terminals
- XC version for usage in extreme ambient conditions available (TU516 only)
I/O Terminal Unit TU516, for I/O expansion modules
| Elements of the I/O Terminal Units | |
|---|---|
| 1 | I/O-Bus (10-pole male) to electrically connect the previous I/O Terminal Unit, the CPU Terminal Base or the FBP Terminal Unit |
| 2 | I/O-Bus (10-pole female) to electrically connect other I/O Terminal Units |
| 3 | Plug (1x 50-pole and 2x 38-pole) to electrically connect the inserted I/O Modules |
| 4 | With a screwdriver inserted in this place, the Terminal Unit and the adjacent I/O Terminal Unit can be shoved from each other |
| 5 | 2 holes for wall mounting |
| 6 | 40 screw-type or spring terminals for signals and power supply voltage |
| 7 | DIN rail |
| Sign for XC version | |
| Screw-type terminals (TU515) | Spring terminals (TU516) | ||||
| Conductor | Screwdriver | Conductor | Screwdriver (opens terminal) |
Figure: Types of terminals
The I/O Terminal Units TU515 (with screw-type terminals) and TU516 (with spring terminals) are specifically designed for use with AC500/S500 I/O modules that incorporate only 24 V DC or analog inputs/outputs.
The input/output modules (I/O expansion modules) plug into the I/O 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 I/O modules without disturbing the wiring at the Terminal Unit.
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 I/O 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 expansion module (see the description of the used expansion module).
The supply voltage 24 V DC for the module’s electronic circuitry comes from the I/O expansion bus (I/O-Bus).
For usage in extreme ambient conditions (e.g. wider temperature and humidity range), a special XC version of the device is available (TU516 only).