Interview Question: Why SCAN time of DCS is more than PLC? or Why does PLC have scan time less than DCS.
If so,then why do we use DCS instead of PLC?
My Interview Answer:
Scan time of DCS is more than the scan time of PLC when the I/O's are digital.Whereas the scan time of DCS is less than the scan time of PLC when the I/O's are analog.Hence DCS is better when analog signals are considered whereas PLC is better when digital signals are considered.However DCS do handle both analog and digital signals. It can also have more no. of I/O's compared to PLC.About 1 lakh I/O’s are available in DCS. Hence we use DCS.
Comments
Post a Comment
If you have any other answer,then please post them in the comments.Thank you