Installation and commissioning
2.2 Installation and electrical connections
CP 243-1
46 Operating Instructions, 03/2012, C79000-G8976-C244-02
● Use cables with a cross section suitable for the power you are using. The 24 V power
supply of the CP 243-1 can be wired with wires with a cross section between 0.50 mm²
and 1.50 mm². When wiring up the grounding terminal, use wires with a cross section of
1.50 mm².
● Do not screw down the connection terminals too tightly. The maximum tightening torque
is 0.56 Nm.
● Keep the wires as short as possible. You should wire in pairs: one neutral or zero
conductor together with a phase conductor or a signal line.
● Separate alternating current wiring and high voltage direct current wiring with fast
switching sequences from the low voltage signal wiring.
● Provide suitable surge protection for cables that may be hit by lightning.
● The S7-200 CPU and the CP 243-1 should be connected to the same power supply!
● The CP 243-1 is equipped with an integrated ribbon cable with a socket for fast
connection to other S7-200 components.
● The slot in which a CP 243-1 can be operated depends on the firmware version of the
S7-200 CPU being used.
● A maximum of one CP 243-1 per CPU is supported.
Electrical requirements
The input voltage must always be +24 VDC. Apply 24 V direct current only from power
sources that provide safe electrical isolation from 120/230 VAC and similar sources of
danger. Safe electrical isolation is, for example, defined in the following standards:
● PELV according to EN 60204-1
● Class 2 or circuit with limited voltage/current according to UL 508
The power supply on the S7-200 bus is provided by the S7-200 CPU.
Make sure that the CP 243-1 is correctly grounded.
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