Analog for Allen-Bradley Rockwell
Analog for Allen-Bradley Rockwell
(OP)
I am looking for a third party supplier that can provide an analog module with higher resolution than 16/15 bit currently available in the A-B product line.
I this is not available would I be able to find this type of input sensitivity in another brand Siemens, Automation Direct etc.
I this is not available would I be able to find this type of input sensitivity in another brand Siemens, Automation Direct etc.





RE: Analog for Allen-Bradley Rockwell
4-byte floating-point number -3.402823E38 to -1.1754944E-38
Maybe your talking PLC5 or slc500? Which is legacy products.
RE: Analog for Allen-Bradley Rockwell
You are correct the data format is Floating point IEEE 32 bit.
I am looking for a converter with greater than 16 bit Range and Resolution specs.
I am guessing this would have to be from a third party supplier.
RE: Analog for Allen-Bradley Rockwell
As my old mentor first told me when I asked about the difference between a DCS and a PLC, he said "PLCs make things, quickly; DCS systems make stuff, accurately."
All that said, Siemens uses their S7-400 PLC I/O hardware for their PCS-7 DCS system, and because of that, they have Analog cards with 24 bit resolution A/D converters (although you only can use 20 bits + sign I think). Of course, that is their most expensive PLC system as well. I think the S7-300 has higher than 16 bit A/d converters but you only can use up to 16 bit on some types of signals.
Have you considered using a separate stand-alone PID controller with higher resolution for direct control of that process and then extracting only pertinent data from is for use in the PLC program?
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