Thermocouple module causing flashing display
Thermocouple module causing flashing display
(OP)
I have several Powers 535 controllers controlling verious Processes using a k type thermocouple as the pv. I am needing to input these temp. signals into a AB 5,03 PLC. My plc is located close to the controllers so I just paralled the TC's over to a 1746-NT8 Thermocouple/mV Analog Input Module. It works great except that now my powers controller occasionally will flash a crazy value on the display. Like say it will be a temp. of 235 degrees C and it will momentairly flash 350 or so. It only does it for a split second and isn't causing any problem other then the bugging the control room operator. It does it maybe every 10 sec. or so. Anyone else see this kind of thing? Any suggestion on how to stop it would very welcomed. Thanks in advance.
Daymond
Daymond





RE: Thermocouple module causing flashing display
RE: Thermocouple module causing flashing display
RE: Thermocouple module causing flashing display
You cant physically put them in parallel and expect a proper temp. Your module has 8 inputs. How many TC's do you have?
What kind of TC are you using?
Also is the PLC programmed properly?
Good luck!!!
Quote: "Its not what you know, its who you know"
Everythings a learning experience-Everything
RE: Thermocouple module causing flashing display
RE: Thermocouple module causing flashing display
RE: Thermocouple module causing flashing display
RE: Thermocouple module causing flashing display
Try turning off the open TC detection on the 1746-NT8 card.
RE: Thermocouple module causing flashing display
Point of info, T/C's Can be connected in parallel, you will just end up with the paralleled temperature readings averaged.
RE: Thermocouple module causing flashing display
Daymond
RE: Thermocouple module causing flashing display
Nice catch djs.
Glad you solved your problem Logger
Later
Quote: "Its not what you know, its who you know"
Everythings a learning experience-Everything