I just wonder how do I read the Alarm registers from Sierra to my Siemen 1212 PLC.

It mention from register : 40256-40270 Alarm Code History
Code===Description
01 ===== Pressure Sensor Failure
02 ===== Package Disch. Temp. Sensor Failure
.
.
.
21 ===== High 1st Stage Disch. Temp.
22 ===== High 2nd Stage Disch. Temp.

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It state : Code, not bit.
Does "Code" transfer or convert as Value (Word) in Modbus reading?

If in my ladder logic, I wrote / compare 1 = 1, the output bit0 = 1,
it is alarm for Pressure failure actives.

But then what happen if there are two Codes appear in the same time?


Let's say, 1 and then 2 Codes alarm appear together.

If the Code 2 appears last, and then the bit1 = 1 (Alarm for Temp) actives.

And now how about the Code 1?
The bit 0 indeed become = 0, since it is Code 2 (Value 2?),
but actually there is still an alarm for Code 1 (Pressure) ......

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It really baffle me out,
can someone help me ... ?

Thanks alot,
and warm regards.