SCHNEIDER ELECTRIC TSXAEY800 MODICON PREMIUM 8 HIGH LEVEL ANALOG INPUT MODULE SCHNEIDER ELECTRIC TSXAEY800 MODICON PREMIUM 8 HIGH LEVEL ANA INP MODULE PV: 04 RL: 09 SV:1.00 MADE IN FRANCE |
The main differences between auxiliary relay M and status relay S in PLC are:
The auxiliary relay M and status relay S are both internal soft relays of the PLC, with only 0 and 1 judging the status, but their functions and usage positions are different.
1. Auxiliary relay M:
The auxiliary relay M is equivalent to the intermediate relay of the general control circuit in practice. It is only used in the PLC internal program (ladder diagram) and cannot drive external loads externally
The ladder diagram is used for logical transformation and logical memory function. The auxiliary relay M includes a universal auxiliary relay, a power-off holding auxiliary relay M, and a special auxiliary relay M. The auxiliary relay M is connected to
External signals can also accept control signals from other internal software components to control other parts. The contacts of M (normally open, normally closed) can be used countless times, but the coil only has one,
This is the commonly used auxiliary relay M; There is also a special auxiliary relay M, which only uses its contacts and only uses its coil.
2. Status relay S:
The status relay S is generally used in stepper state programming SFC, and one status relay is usually used for each state, using only the coil of S instead of the contact. When programming PLC, the
The contact symbol of STL+status relay S represents entering the state of this relay code, so there is no need for contacts in programming circuits.
If the status relay S is not used for step command programming SFC, it can also be used as auxiliary relay M, using the same method as auxiliary relay M.
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