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Allen Bradley PLC SCP help

B

BIGEYE

Jan 1, 1970
0
We have an Allen Bradley PLC programmed by others. I have two analogue
inputs connected and their inputs are programmed to a SCP Scale with
parameters block.
The two 4 to 20 mA inputs are from gas monitors ant the range of the
monitors is 0 to 90 parts per billion. Both inputs are the same and perform
the same functions.
However, both SCP blocks are scaled differently and ask if one of them is
incorrect.
4 to 20 mA input = 0 to 90 PPB.
Block 1 is programmed as
Input min = 3277
Input max = 16384
Scaled min = 0
Scaled max =90

Block 2 is programmed as
Input min = 3277
Input max = 16384
Scaled min = 0
Scaled max =900

Appreciate any advice.
TIA
 
S

SQLit

Jan 1, 1970
0
BIGEYE said:
We have an Allen Bradley PLC programmed by others. I have two analogue
inputs connected and their inputs are programmed to a SCP Scale with
parameters block.
The two 4 to 20 mA inputs are from gas monitors ant the range of the
monitors is 0 to 90 parts per billion. Both inputs are the same and perform
the same functions.
However, both SCP blocks are scaled differently and ask if one of them is
incorrect.
4 to 20 mA input = 0 to 90 PPB.
Block 1 is programmed as
Input min = 3277
Input max = 16384
Scaled min = 0
Scaled max =90

Block 2 is programmed as
Input min = 3277
Input max = 16384
Scaled min = 0
Scaled max =900

Appreciate any advice.
TIA

I will bet that Block 2 is a typo.. Does block 1 work correctly?
 
B

BIGEYE

Jan 1, 1970
0
SQLit said:
I will bet that Block 2 is a typo.. Does block 1 work correctly?

Yes it works correctly, I think you are right that it is a mistake.
 
S

SQLit

Jan 1, 1970
0
BIGEYE said:
Yes it works correctly, I think you are right that it is a mistake.

It is easy to make mistakes when programing PLC's. I check and recheck every
key stroke 3 times before walking away from a program.
 
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