7. APPLICATION INSTRUCTIONS
7
−
92
MELSEC-A
(3) It is impossible to execute 2 or more LRDP instructions simultaneously or to
execute the LRDP instruction and the LWTP instruction simultaneously to one
local station.
POINT
Provide interlock using M9200, M9201, M9202 and M9203 so that the LRDP
instruction and/or the LWTP instruction may not be executed during the data
read from local stations by the LRDP instruction.
(4) Values of D9200 of the master station indicate the execution result of the LRDP
instruction as mentioned below.
D9200 value
Execution result
0 Normally
completed.
2
Device setting error (Operation error)
•
Devices specified at (S) or (D) exceed the device range of the master or local
stations.
•
n1 value is other than 1 to 64
•
n2 value is other than 1 to 32.
3
Specified local station is not provided with data link.
4
Specified station number is not of the local station. (Operation error)
(5) If the LRDP instruction is executed with a local station, operation error occurs.
Execution Conditions
Operation Errors
In the following cases, operation error occurs and the error flag turns ON.
•
The station number specified at "n1" is not of a local station.
•
"n2" points starting at (S) exceed the specified device range.
•
Specification of "n2" is other than 1 to 32.
POINT
If the CPU to execute the LRDP instruction is not for data link operation or if
the mode switch of the link card is set offline, no operation error occurs and
only M9200 (LRDP instruction acceptance flag) is turned on. Processing of the
LRDP instruction is not performed.
Read
command M9200 M9201 M9202 M9203
K
K
LRDP 3
D3
D99
6
Read command
Executed only once
LRDP
OFF
ON
Содержание MELSEC-A series
Страница 1: ......
Страница 2: ......
Страница 13: ...A 11 MEMO...
Страница 505: ...APPENDICES APP 100 MELSEC A MEMO...
Страница 507: ......
Страница 508: ......