What is purpose to use relay after digital output module?
Why normally we don't use relay for digital input module?
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Answer Posted / madam.bhupal
Because digital output module out put lode capacity is low
and use relay then we can incrise the output lode & lode
short ckt proctaction also....
in input module pts not need more current and voltage just
a on-off pules.
some time need digital input card also as per req.
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