... security, to prevent accident and stop.2. SR series's specificationSR has several specification.They are SR4P2A1B22,SR4P2A1B24,SR4P2A1B24P,SR4P2A1B24N ... for example transducer,high frequency machine and so on),the controller should be far away from them to avoid the interference ... 1)Output various form,widely application.(2)The input contacts's short citcuit fault can be detected,safety performance is ...