Siemens S7-200 - Supplying Power for the TD Device

Installing your Text Display (TD) Device
2.8 Supplying Power for the TD Device
Text Display (TD) User Manual
42 System Manual, 08/2008, A5E00765548-03
2.8 Supplying Power for the TD Device
Supplying Power for the TD Device
The S7-200 CPU uses the TD/CPU cable to provide power to the TD device. Use this type of
power supply when the distance between the TD device and the S7-200 CPU is less than
2.5 m (the length of the TD/CPU cable). The TD 200, TD 200C and the TD400C have the
option of using an external power supply.
Tip
The TD 100C device must use the TD/CPU cable to provide power from the S7-200 CPU to
the TD device. The TD 100C does not have the option of using an external power supply.
Tip
If the distance between the TD 200, TD 200C or TD400C and the S7-200 CPU is greater
than 2.5 m, use an external 24 VDC power supply.
If you require a longer cable (greater than 2.5 m) to connect the TD device to the S7-200
CPU, use PROFIBUS components for the network connection. Refer to the SINEC IK10
Catalog.
Refer to Appendix B for information about using the TD device on a network.
As shown in the figure below, the TD device provides up to two options for providing power:
● The TD/CPU cable allows the S7-200 CPU to provide power to the TD device over the
communications port. This is the only option available for the TD 100C.
For information about the TD/CPU cable and the communications port, refer to
Appendix B.
● You can connect the TD 200, TD 200C or the TD400C to an external power supply.
The TD 200, TD 200C or TD400C requires 120 mA at 24 VDC to operate. An optional
power connector is provided with the TD 200, TD 200C and the TD400C.
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Figure 2-9 Connecting Power to the TD Device (TD 200, TD 200C, and TD400C)