9
·
13
9
(2) Communication delay time
The communication data on the satellite net may have the delay shown below.
①
Delay of input module
②
Time required for PC to detect input state (one operation cycle max.)
③
Operation time of sending PC (one operation cycle)
④
Time to complete sending of operation result (one communication cycle max.)
⑤
Time required for receiving PC to write receive data in PC data memory
(one operation cycle max.)
⑥
Operation time of receiving PC (one operation cycle)
⑦
Delay of output module
Communication delay time is the total time of
①
to
⑦
above.
The buffer memory contents of the JW-20CM is renewed for each PC operation cycle.
Therefore, a contact point which turns “ON” for only one operation cycle of a PC may not be
transferred.
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;
;;;
;;;
①
②
③
④
⑤
⑥
⑦
ON
PC00
PC01
O N
I / O
PC00
JW-20CM
JW-20CM
P C 0 1
I / O
Operation cycle
(Communication)
Remarks
