GSK 218M, Connection And Plc Manual

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GSK218M CNC System Connection and PLC Manual
21
2.5.4 Difference o fstate of signals between 1
st
level and 2
nd
level
The state of the same input signal may be different in the 1
st
level and 2
nd
level sequences. That is,
at 1
st
level, processing is performed using input signal memory and at 2
nd
level, processing is
performed using the 2
nd
level synchrounous input signal memory. Therefore, it is possible for a 2
nd
level sequence execution at the worst, compared with a 1
st
level input signal.
This must be kept in mind when writing the sequence program.
B1 and B2 are not 1 simultaneously after the signal A is processed synchronously by the medium
relay.
R
B1
END1
B2
A
B1
A
B2
END1
When A=0, and B1=1, A becomes 1, at this time, the next line of ladder is executed, B2=1. B1
and B2 are also 1.