Installation And Electrical Connections - Siemens CP 243-1 Operating Instructions Manual

Protection against transient voltage surges
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
This is the case if you only operate devices with SELV (safety extra-low voltage).
2.2

Installation and electrical connections

Installation
You can install the devices of the S7-200 series either in a control panel or on a DIN rail. You
can arrange the modules both horizontally and vertically. The S7-200 CPU and the
expansion modules are designed for natural heat dissipation by convection. For this reason,
leave a clearance of at least 25 mm above and below the devices so that the heat is free to
escape. Long operating times at maximum ambient temperatures and maximum loads will
shorten the lifespan of the electrical components of the device.
When using firmware version on the CPU of 1.2 or higher, the CP 243-1 can be installed in
any one of 7 positions in an S7-200 system.
Wiring
If you attempt to install or remove the CP 243-1 or other devices while they are on, you may
receive an electric shock or the devices may not work properly.
If the power for the CP 243-1 and all connected devices is not switched off while the
devices are being installed/removed, this may cause injury and/or property damage.
Take all necessary safety precautions and make sure that the power for the S7-200 and the
CP 243-1 is turned off before you begin wiring.
General guidelines
Below, you will find some general guidelines for wiring your programmable controller:
● Make sure that you comply with all valid and binding standards when you wire up your
● Only wire up the S7-200 CPU and the CP 243-1 when the power is turned off!
CP 243-1
Operating Instructions, 03/2012, C79000-G8976-C244-02
WARNING
WARNING
CP 243-1. When installing and operating the device, keep to the relevant national and
regional regulations. Ask your local authorities for the standards and regulations that
apply to your specific situation.
Installation and commissioning
2.2 Installation and electrical connections
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