Set Values For The Extension Timer And Counter; Cautions On Using Index Qualification - Mitsubishi MELSEC-A Series Programming Manual

3. INSTRUCTION STRUCTURE

3.8.3 Set values for the extension timer and counter

3.8.4 Cautions on using index qualification

(1) Check device numbers when index qualification is used
Set values for the timer and counter, shown below, (extended by the AnA, A2AS,
AnU, QCPU-A (A Mode) and A2USH board) used for the OUT instruction devices
should be set with the devices (D, W or R) specified by parameters. For details, refer
to the A2A(S1)/A3ACPU User's Manual, the A2U(S1)/A3U/A4UCPU User's Manual
or the ACPU (Fundamentals) Programming Manual A2ASCPU(S1) Usds Manual.
Timer T
Counter C
Example
• When the set value device for T256 is specified at D370 with parameters:
The AnA, A2AS, AnU, QCPU-A (A Mode) and A2USH board does not check
device numbers when index qualifi-cation is used in order to increase the speed
of operation processing. Because of this, error occurred in the result of index
qualification is not detected as operation error. When error occurred in the result
of index qualification, data of the devices other than specified change.
Exercise great care in writing programs which contain index qualification.
256 to 2047
256 to 1023
3 − 17
MELSEC-A