The module is a digital output module that is equipped with 4 opto-triac outputs using phase-angle control. L and N are fed to the module for zero-crossing detection.
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ABB V18345-2021520001 Electro-Pneumatic Positioner, intelligent, configurable, with indicato and operator panel,Input 4 ... 20 mA, two-wire, with connector plug for LKS adapter and Fmodule for HART communication, FM / CSA, Double acting, fail freeze