Siemens S7-200 - Building a TD;CPU Cable

Connecting Multiple Devices on a Network
B.6 Building a TD/CPU Cable
Text Display (TD) User Manual
158 System Manual, 08/2008, A5E00765548-03
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Figure B-3 Bias and Termination of the Network Cable
B.6 Building a TD/CPU Cable
Building a TD/CPU Cable
The TD/CPU cable is used for connecting a display device to an S7-200 CPU. If you do not
have a TD/CPU cable, refer to Figures B-4 and B-5 to create your own cable.
Making a Cable That Supplies Power to the TD Device
CAUTION
Connecting the 24 VDC power output (pin 7 of communication port) of multiple S7-200
CPUs may cause erratic operation of the I/O, which could potentially cause personal injury
and/or property damage.
The 24 VDC power supply is also the sensor supply for the I/O. Interconnecting the output
power supplies of multiple CPUs could possibly overload the sensor supply, which could
cause the I/O to operate incorrectly.
When networking S7-200 CPUs, connect only the communication lines (pins 3, 5, and 8).
You must not connect the power output (pin 7).
Tip
The TD 100C must use the TD/CPU cable shown in Figure B-4.