The communication data on the satellite net may have the delay shown below.
I / O
P C 0 1
①Delay of input module
②Time 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.