39SDM024DCCBN | 16101-174R/12 Siemens SDM+Standard Discrete Module

The Standard Discrete Module (SDM) interfaces discrete DC sensors and actuators with the APACS+controller’s IOBUS. The SDM provides 32 channels, each of which can be configured to be an input,output, or pulse output. The SDM’s inputs are current sinking (i.e. the input device is wired between the power supply positive (+) and the I/O terminal). Outputs are sourced (i.e. the output device is wired between the output terminal and the power supply common). A pulsed output is an output channel that is “ON” for a user-defined duration (within the range of 10 to 2000 msec).All input and output circuits are electrically isolated from the SDM’s CPU, IOBUS, and ground. In addition, each output is individually fused with a replaceable miniature fuse. This protects the output channel from a short circuit in the field wiring and prevents the short circuit from affecting other channels on the module. The SDM Discrete Input (Disc In) channel returns a boolean (BOOL) variable. There are no softlist parameters for the Disc In channel.