SiemensFM355-2
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What measures are required to operate the analog inputs?
What measures are required to operate the analog inputs of this module without errors?
SiemensFM355-2
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Top answer
The following conditions must be met to operate this module without error:
- Set a low resistance connection between the reference point of the analog measuring circuit and the CPU connection.
- If the sensors are equipped with external voltage, you must connect the external voltage mass to the CPU mass.
- Skip unused COMP + and COMP- inputs
- Connect all M- unused channels by ground
- Connect ground and M- isolated transmitters
- If you do not have isolated transmitters, connect the ground to a ground conductor.
- Using a thermometer and resistance, M- should be connected to ground
- To measure current, an external resistor of a 50 ohm sensor must be connected to the analog inputs between M + and M-
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