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Description
A safety loop is a loop of interlocking control that protects the load or control object and prevents operational errors or control failures. In the direct control of the load at the same time, the safety protection loop to the PLC input signal, in order to facilitate the PLC protection processing. Safety circuits generally consider the following aspects.
(1) Short-circuit protection should be installed in the PLC external output circuit fuse, short-circuit protection. It is best to install a fuse in the circuit of each load.
AFPS-01C
(2) Interlock and interlock measures in addition to ensuring the interlock relationship of the circuit in the program, the external wiring of the PLC should also take hardware interlock measures to ensure the safe and reliable operation of the system.
(3) Voltage loss protection and emergency shutdown measures PLC external load power supply line should have voltage loss protection measures, when the temporary power failure and then restore power supply, do not press the “start” button PLC external load can not start by itself. Another function of this wiring method is that when emergency shutdown is required under special circumstances, the load power supply can be cut off by pressing the “emergency stop” button, and the “emergency stop” signal is input to the PLC.
(4) Limit protection In some cases such as elevator class exceeding the limit may produce danger, set the limit protection, when the limit protection action directly cut off the load power supply, while the signal input PLC.
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