IMDSO14 ABB Bailey Digital Output Module IMDS014

The IMDSO14 Digital Output module (DSO) outputs 16 digital signals from the INFI 90 OPEN system to control a process. It is an interface between the process and the INFI 90 OPEN Strategic Process Management System. The signals provide digital switching (ON or OFF) for field devices. Control modules perform the control functions; I/O modules provide the input/ output functions.

Figure 1-1 illustrates the INFI 90 OPEN communication levels and the position of the digital output modules within these levels.

The DSO module consists of a single printed circuit board that occupies one slot in a module mounting unit (MMU). It outputs 16 separate digital signals through solid state circuits on the printed circuit board. Twelve outputs are isolated from each other; the remaining two pairs share common positive output lines.

Two captive screws on the faceplate secure the module to the MMU. The upper two front panel red and greed LEDs indicate the module operating status. The 16 lower front panel red LEDs (group A and group B) display the module output states (ON or OFF).

The DSO module has three card edge connectors for external signals and power (P1, P2 and P3). P1 connects to logic power (+5 VDC) that drives the module circuits. P2 connects the module to the I/O expander bus to communicate with a control module. P3 outputs the digital signals using a cable connected to a termination unit (TU) or a termination module (TM). The terminal blocks (physical connection points) for field wiring are on the TU or TM.