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Appendix D USEND_T and
URCV_T Execution Times
Since execution of the USEND_T and URCV_T instructions involves instruction
processing that extends across multiple scans, the execution times differ in each of the
states at instruction activation time, response wait time, and instruction completion time.
(1) For PC link transmission
The following operations are performed for PC link transmission:
Scan during instruction activation: Transmission request or reception request to the
remote station
During the next and later scans: Checking the response wait state from the remote
station or completion processing
(2) For EN311 module control
The follow operations are performed during EN311 module control:
Scan during instruction activation: Execution of commands to the local station
(EN311)
During the next and later scans: Checking the response wait state from the local
station (EN311) and completion processing
Table D-1 Instruction Execution Times for PC Link Transmission
N: Number of words transmitted (1-485)
Execution time (µs)
Register write (USEND_T) Register read (URCV_T)
At instruction
activation
315 + 0.3 × N At instruction
activation
305
During response wait 200 During response wait 200
At completion 235 At completion 235 + 0.4 × N
Table D-2 Module Control Request Instruction Execution Times
Command/Code Function block Execution time (µs)
Reset request/
16#0311
USEND_T At instruction
activation
290
During response wait 200
At completion 220
Parameter setup
request/16#0312
USEND_T At instruction
activation
295
During response wait 200
At completion 220
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