How to stop RTD value reaching up to tripping value when my wire break.
When ever RTD wire get break my temprature goes to full range and drive get tripped.How can i kept the value of analogue input value at previous value if value rises suddenly in few second and reach up to tripping value
Depending on the type of IO modules used, you can do one of the following: 1. Set a "Safe value" (like ISP) for the channel. In this case the module/system will automatically set a certain value or keep last value when a wire break is detected. 2. Write a program/some code that will detect a (too) fast rate of change (many signal monitoring function blocks have this option) and set the "Safe value" in there. If the module has a wire break detection signal you may use this instead.
Remember to set it up so that you prevent any false-positives and other problems to your plant.