Title: +038=360.000-OU045T_04-PCD2.m4160 PLS SBC - IO Manual.pdf
(Often available as normal components on standardized contactors and valves).When switching direct voltage it is urgently recommended that a recovery diode is fitted above the load. This should even take place when, theoretically, an Ohmic load is switched. In practice, there will always be a proportion which is inductive (connection cable, resistance coil, etc.). In this case it should be noted that the switch-off time will be longer.(Approximate Ta . L / RL * √ (RL * IL / 0,7).For direct voltage, transistor output modules are recommended.A.4.4Relay manufacturer’s information on RC unit dimensioningWiring contact protection:The purpose of contact protection wiring is to suppress switch arcing (“sparks”) and thereby prolong the lifetime of the contacts. All protection wiring has disad- vantages as well as advantages. For the cancellation of arcing by means of an RC unit, see adjacent diagram.