Siemens SIMATIC S7-1200 Panduan Petunjuk Pengoperasian - Halaman 25

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Siemens SIMATIC S7-1200 Panduan Petunjuk Pengoperasian

Removing the IE FC RJ-45 Plug 180

Press the release button of the IE FC RJ-45 Plug 180 and pull it out of the twisted pair port of

the CSM 1277.

4.7

Possible sources of problems and how to deal with them

Fuses

Note

The CSM 1277 compact switch module has a resettable fuse / PTC. If the fuse triggers (all

LEDs are off despite correctly applied power supply), the device should be disconnected

from the power supply for approximately 30 minutes before turning it on again.

LED display when voltage is too low

If the power supply is too low, then the internal power supply will switch off causing the

DIAG-LED and all port LEDs to go off. The functionality of the CSM 1277 is no longer

available. A supply voltage of at least 19.2 V is necessary for correct operation.

LED display in case of reverse polarity of the power supply

The CSM 1277 is equipped with reverse polarity protection. A reverse polarity of the supply

voltage does not cause any damage but will not result in any function either. The DIAG-LED

and all port LEDs are off.

Device defective

If a fault develops, please send the device to your SIEMENS service center for repair.

Repairs on-site are not possible.

Compact Switch Module CSM 1277

Operating Instructions, V. 1.20, A2B00079397B

4.7 Possible sources of problems and how to deal with them

Mounting