Hi,
We have RTDs connected to a Siemens PLC S7-315 system. Out of the 15 or so RTDs connected, all show correctly except for 5. For all these 5, the process temperature is displayed correctly until 113 degC. Beyond that the value jumps to 285.67.
The RTDs used are 3-wire, PT-100, simplex E&H type.
There is a MTL 7755ac barrier in between the RTD and the PLC AI module, but even on bypassing the barrier, the situation remains the same.
How do I diagnose this problem and what could be a likely solution?
Thanks in advance.
We have RTDs connected to a Siemens PLC S7-315 system. Out of the 15 or so RTDs connected, all show correctly except for 5. For all these 5, the process temperature is displayed correctly until 113 degC. Beyond that the value jumps to 285.67.
The RTDs used are 3-wire, PT-100, simplex E&H type.
There is a MTL 7755ac barrier in between the RTD and the PLC AI module, but even on bypassing the barrier, the situation remains the same.
How do I diagnose this problem and what could be a likely solution?
Thanks in advance.