Toshiba V Series User Manual page 241

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
During the next and later scans:
At instruction
activation
During response wait
At completion
(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
During the next and later scans:
Command/Code
Reset request/
16#0311
Parameter setup
request/16#0312
6F8C0904
Table D-1 Instruction Execution Times for PC Link Transmission
N: Number of words transmitted (1-485)
Execution time ( µ s)
Register write (USEND_T)
315 + 0.3 × N
200
235
Table D-2 Module Control Request Instruction Execution Times
Function block
USEND_T
USEND_T
remote station
Checking the response wait state from the remote
station or completion processing
Register read (URCV_T)
At instruction
activation
During response wait
At completion
(EN311)
Checking the response wait state from the local
station (EN311) and completion processing
Execution time ( µ s)
At instruction
activation
During response wait
At completion
At instruction
activation
During response wait
At completion
305
200
235 + 0.4 × N
290
200
220
295
200
220
221