General Guidelines - Siemens SIMATIC NET CP 243-1 Technical Manual

09/02

General guidelines

General guidelines to follow when wiring your automation system:
• Ensure that all applicable and binding standards are complied with when wiring
the CP 243-1. Observe the appropriate national and regional regulations when
installing and operating the device. Inquire at local authorities regarding stan-
dards and regulations that must be complied with in your particular case.
• Wire the S7-200 CPU and the CP 243-1 in a de-energized state only!
• Use cables with a cross section appropriate for the current in each case. The
24 V supply of the CP 243-1 can be wired with cables with a cross section be-
tween 0.50 mm² and 1.50 mm². For wiring ground terminals, use cables with a
diameter of 1.50 mm².
• Do not tighten the connecting terminals excessively. The maximum permissible
torque is 0.56 Nm.
• Always lay the cables over as short a distance as possible. Cables should be
laid in pairs: a neutral conductor together with a phase conductor or signal ca-
ble.
• Separate AC wiring and high-voltage DC wiring with rapid switching sequences
from low-voltage signal wiring.
• Provide cables at risk of being struck by lightning with a suitable surge protec-
tion.
• The S7-200 CPU and the CP 243-1 should be connected to the same power
supply!
• The CP 243-1 is supplied with an integrated ribbon cable with a connector
socket for quick connection to other S7-200 components.
• The firmware version of the S7-200 CPU in use dictates in which slot a
CP 243-1 can be operated (see note on page 20).
• A maximum of one CP 243-1 can be used per CPU.
CP 243-1
J31069-D0428-U001-A1-7618
Installation and commissioning
21