AH500 Programming Manual
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8. The PLC status change log
SR309~SR390
SR309: The maximum number of PLC status change logs which are stored in SR309 is 20.
Every PLC status change log occupies 4 registers. The PLC status change actions
which are recorded are numbered, as shown in the following table.
The PLC is supplied with power.
Default setting of the PLC
(1. RST button; 2. Communication command)
5
Pressing the CLR button on the PLC
(Clearing the data in the latched device)
6
SR310: The PLC status change log pointer points to the latest PLC status change log.
When the PLC status is changed once, the value of the PLC status change log
pointer increases by one. The range of pointer values is 0~19. For example, the
PLC status change log pointer points to the fourth PLC status change log when the
value in SR310 is 3.
The time when the PLC status change actions occur is recorded in SR311~SR390. The
corresponding functions of these data registers are as follows.
Number
*Time when the PLC status change action occurs
1 SR311
2 SR315
3 SR319
High byte
Low byte
High byte
Low byte
High byte
Low byte
4 SR323
High byte
Low byte
High byte
Low byte
High byte
Low byte
5 SR327
High byte
Low byte
High byte
Low byte
High byte
Low byte
6 SR331
7 SR335
8 SR339
9 SR343
10 SR347
High byte
Low byte
High byte
Low byte
High byte
Low byte
11 SR351
High byte
Low byte
High byte
Low byte
High byte
Low byte
12 SR355
High byte
Low byte
High byte
Low byte
High byte
Low byte
13 SR359
14 SR363