GSK 218M, Руководство по подключению и программированию PLC

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GSK218M CNC System Connection and PLC Manual
20
2.5.1 Input signal processing
（ 1 ） Input memory of NC
The input signals from NC are loaded in memory of NC and are transferred to the PLC at intervals
of 4ms. Since the 1
st
level sequence part directly refer to these signal and process operations.
（ 2 ） Input signal memory to machine tool
The input signal memory stores signals transferred from the machine tool at intervals of 2ms
period. Since the 1
st
level sequence part directly refer to these signal and process operations.
（ 3 ） 2
nd
level inpt signal memory
The 2
nd
level input signal memory is also called as 2
nd
level synchronous input signal memory. The
stoed signals are processed by the 2
nd
level sequence part. State of the signals set this memory
cynchronizes with that of 2
nd
level sequence part.
Input memory Signals from NC and machine tool are transferred to the 2
nd
level input signal
memory only at the beginning of execution of the 2
nd
level sequence part. Therefore, the state of
the 2
nd
level synchronous input signal memory does not change from the beginning to end of the
execution of the 2
nd
level sequence part.
2.5.2 Output singal processing
（
1
）
NC output memory
The output signals are transferred form the PLC to the NC output memory at intervals of 4ms.
（
2
）
Output signals to machine tool
Output signal to the machine tool from PLC output signal memory to the machine tool.
Note:
The state of the NC input memory, NC output memory, input signals from machine, input/output
memory signals to machine can be checked by using the PC self-diagnosis function. The
self-diagnosis number specified is the address number used by the sequence program.
2.5.3 Syncrhonous processing short pulse signal
1
st
level sequence part is used for processing the short pulse signal. But when it is less than 4ms,
namely, when 1
st
level sequence is executed, the state of input signal may change as follows: