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The AXM LD OFB
Internal Operation
External view
The EXEC AXM LD instruction starts the transfer sequence if the OFB is not
already being executed.
While this sequence is being run, the AXM LD, READY and AXM LD, ERROR
bits are set to 0.
Once the transfer is complete, the AXM LD, READY bit is reset to 1 and the
AXM LD, ERROR bit is set to 1 if the transfer was unsuccessful. The AXM LD
Status variable allows the user to identify the type of problem encountered.
Transfer duration
C
3
AXM LD, READY
AXM LD, ERROR
EXEC AXM LD
INSTRUCTION
or set LOAD bit
to 1 (1)
The module is not reset to Run by the OFB
It is up to the user to do this once the transfer is complete, i.e. when the AXM
LD, READY bit changes from 0 ¿ 1 on condition that the ERROR bit is at 0.
If the EXEC AXM LD instruction is encountered again while a transfer is in
progress, it is ignored.
It is up to the user to ensure that the EXEC AXM LD instruction is only scanned
once in a program. This instruction should be conditional on an event that will
only occur once during a PLC cycle (bit SY0, SY1, rising edge, etc.).
(1) Using PL7-3 (in DATA mode) or SYSDIAG.
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