jfast
Member
Hello,
I've a question regarding wiring analog inputs (4-20mA) to a compact-logix 1769-IF8 module.
The PLC and module exist already and are wired for 2-wire transmitter analog input, with loop power being derived from a 24VDC power supply in this panel. All 8 Analog input common terminals are jumpered together and bonded to DC- on this power supply (ANLG Com = V/l in 0- = ... = V/l in 7-) to avoid noise.
As a retrofit, I need to wire in two 4-20mA outputs from a device in the field, to spare channels on this slot. The outputs are coming from a Trane Programmable air handler control panel, model MP580. See pg 11 of manual:
http://www.wmitechnologies.com/pdfs/MP581-INFO.pdf
The MP580 has two universal analog outputs configured as 4-20mA. I am assuming they are not loop powered analog outputs.
Can I safely wire this analog output to my IF8 analog input, using my local 24VDC power supply to provide loop power? Or, do I need a loop isolator?
Thanks in advance! ... This stuff throws me through a loop for some reason.
I've a question regarding wiring analog inputs (4-20mA) to a compact-logix 1769-IF8 module.
The PLC and module exist already and are wired for 2-wire transmitter analog input, with loop power being derived from a 24VDC power supply in this panel. All 8 Analog input common terminals are jumpered together and bonded to DC- on this power supply (ANLG Com = V/l in 0- = ... = V/l in 7-) to avoid noise.
As a retrofit, I need to wire in two 4-20mA outputs from a device in the field, to spare channels on this slot. The outputs are coming from a Trane Programmable air handler control panel, model MP580. See pg 11 of manual:
http://www.wmitechnologies.com/pdfs/MP581-INFO.pdf
The MP580 has two universal analog outputs configured as 4-20mA. I am assuming they are not loop powered analog outputs.
Can I safely wire this analog output to my IF8 analog input, using my local 24VDC power supply to provide loop power? Or, do I need a loop isolator?
Thanks in advance! ... This stuff throws me through a loop for some reason.