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Installation and Commissioning
General guidelines
Below are some general guidelines for wiring your programmable controller.
• Be sure to comply with all valid and binding standards when you wire your CP
243-1 IT. When installing and operating the device, adhere to applicable na-
tional and regional regulations. Ask your local authorities for the standards and
regulations which apply to your special situation.
• Only wire the S7-200 CPU and the CP 243-1 IT in a de-energized state!
• Use lines with the cross section appropriate for the particular electricity strength.
The 24 V power supply of the CP 243-1 IT can be wired with lines with a cross
section between 0.50 mm² and 1.50 mm². For the wiring of the grounding termi-
nal, use lines with a cross section of 1.50 mm².
• Do not tighten the connection terminals too tight. The maximum tightening mo-
ment is 0.56 Nm.
• Keep the lines as short as possible. Lines should be installed in pairs - one neu-
tral or directly grounded 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 overvoltage protection for lines which may be hit by lightning.
• The S7-200 CPU and the CP 243-1 IT should be connected to the same power
supply!
• The CP 243-1 IT is equipped with an integrated ribbon cable with connection
socket for fast connection to other S7-200 components.
• The slot on which a CP 243-1 IT can be operated depends on the firmware ver-
sion of the S7-200 CPU being used. See note on page 47.
• A maximum of one CP 243-1 or one CP 243-1 IT is supported per CPU.
Electrical requirements
The input voltage must always be 24 V DC. Apply 24 V direct current only from
current sources which offer secure electrical separation from 120/230 V AC and
similar sources of danger. Secure electrical separation is defined in the following
standards.
− PELV in acc. w. EN60204-1
− Class 2 or current circuit with limited voltage/current in acc. w. UL 508
The power supply on the S7-200 backplane bus is provided by the particular S7-
200 CPU.
Make sure that the CP 243-1 IT is correctly grounded.
48
03/03
CP 243-1 IT
J31069-D0429-U001-A0-7618
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