theColonel26
Lifetime Supporting Member
E-Stop Circuits In US Food and Beverage Industry.
My Colleague and I are new to the food and beverage industry.
We want to know if it is common practice to only have the PLC monitor one NC from the E-Stop and nothing else to determine if a safety circuit is tripped. In the Automotive industry, it is more common to Monitor at least 3 things.
This way the PLC can determine if there is an issue in the safety circuit, and we can signal the HMI to display a message telling the operator what the problem is, and why the machine won't start.
We have been met with bafflement from 2 different controls engineer that came up in the Food and Beverage industry.
Thoughts?
My Colleague and I are new to the food and beverage industry.
We want to know if it is common practice to only have the PLC monitor one NC from the E-Stop and nothing else to determine if a safety circuit is tripped. In the Automotive industry, it is more common to Monitor at least 3 things.
- Safety Circuit, power right after the fuse
- E-Stop NC (E-Stop Output)
- E-Stop NO going only to the PLC
This way the PLC can determine if there is an issue in the safety circuit, and we can signal the HMI to display a message telling the operator what the problem is, and why the machine won't start.
We have been met with bafflement from 2 different controls engineer that came up in the Food and Beverage industry.
Thoughts?