Siemens SIMATIC ET 200M Operating Instructions Manual page 83

See also
Wiring rules (Page 78)
5.4.3 Wiring front connectors of the signal modules
S7-Ex-modules
For information on how to wire the S7-Ex-modules and what you should observe when wiring
modules in the intrinsically safe area, refer to the "S7-300 Automation Systems, ET 200M Ex
I/O Modules (http://support.automation.siemens.com/WW/view/en/1096709)" reference
manual.
Cables
You can use the flexible cables with cross-sections as specified in the "Wiring rules
(Page 78)" chapter.
You do not need wire end ferrules.
If you use wire end sleeves, only use such as are specified in the "Wiring rules (Page 78)"
chapter.
Types of Front Connector
The 20-pin and 40-pin front connectors are available in 2 designs: Cage-clamp terminals and
screw-type terminals. For order numbers, refer to the appendix "Order Numbers for the ET
200M (Page 247)".
Cageclamp Technology
The front connectors in the cage-clamp technology can be wired very easily: Insert the
screwdrivers vertically in the opening with the red opening mechanism, insert the cable in the
associated terminal and then pull out the screwdriver.
Tip: There is a separate opening for test probes up to 2 mm in diameter to the left of the
opening for the screwdriver.
Wiring for Module Change During Operation
If you wire modules for an ET 200M with the "module change during operation" function, you
will require longer cables to the front connectors in order to easily insert and remove the
modules during ET 200M operation. We recommend you make the wiring to the front
connector approx. 20 cm longer.
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
5.4 Wiring the power supply and modules
Connecting
81