Digital Output module | IMDSO14 | ABB

Technical Specifications

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

Digital signals have two states, ON or OFF. The DSO moduledigital outputs switch voltages of 24 VDC at 250 milliamps or48 VDC at 125 milliamps. This voltage energizes (turns on)and de-energizes (turns off) a field device or relay.

Functional Operation

The DSO module consists of a single printed circuit boardthat occupies one slot in a module mounting unit (MMU). Itoutputs 16 separate digital signals through solid state circuitson the printed circuit board. Twelve outputs are isolated fromeach other; the remaining two pairs share common positiveoutput lines.Two captive screws on the faceplate secure the module to theMMU. The upper two front panel red and greed LEDs indicatethe module operating status. The 16 lower front panel redLEDs (group A and group B) display the module output states(ON or OFF).The DSO module has three card edge connectors for externalsignals and power (P1, P2 and P3). P1 connects to logic power(+5 VDC) that drives the module circuits. P2 connects themodule to the I/O expander bus to communicate with a control module. P3 outputs the digital signals using a cableconnected to a termination unit (TU) or a termination module (TM). The terminal blocks (physical connection points) forfield wiring are on the TU or TM. 

Output Control Logic

An output register holds the data that controls the outputs.The I/O expander bus interface writes control module data tothis register. This data, sent to the data selector, determinesthe output states (ON or OFF).Default data from the control module is sent to the default register. The control module configuration sets the default values(Function Code 128). The default register is reset to logic zerosduring power up to drive the outputs to a de-energized state.FC 128 in the control module configuration selects the outputvalues used to drive the output circuits in the event of a control module failure (time-out). If FC 128 is not defined, the outputs will go to a de-energized state during a time-out. Refer toBUS FAULT TIMER in this section for further explanation oftime-out. 

The default control logic block is a one bit latch register. Itsends a signal to the data selector block to select either thedefault register data or the output register data during atime-out (indicating a control module error). This signal isdependent on the control module configuration (FC 83 specification S2). The bus fault detector in the I/O expander businterface checks for a time-out condition. During a time-out, thedata selector block normally selects the default register data. Ifa hold option is selected in FC 83, the default control logic circuits send a logic 1 to override the data selector. It causes thedata selector to drive the outputs with the output register datainstead of default data to maintain the outputs at their currentvalues (hold)

Technical FAQ

Q: What is the function of the IMDSO14? 
A: It acts as a digital slave output module to control field process devices from control commands.

Q: What precautions are needed when replacing an older DSM05 with a DSO14?
A: You must reverse the polarity of the output wires, and note that it does not support Digital Line Monitoring (DLS).

Q: What is the modern replacement for this module?
A: The direct newer equivalent part number within the ABB Symphony Plus line is the SPDSO14.

Q: Do you supply brand-new, original parts or second-hand refurbished items?

A: Our stock consists of Original New items; all products undergo quality inspection to ensure they are fully functional.

Q: What guarantees are included with the shipment?
A: All items in stock are tested by engineers, packed in professional ESD packaging, and shipped via express logistics with a global delivery time of 24–48 hours.

Q: How long does global shipping take?
A: Stock items are typically dispatched within 24 hours. Shipments are sent via DHL or FedEx Express, taking approximately 3–5 days to reach Asia, 4–6 days to Europe and the Middle East, and usually arriving within a week in major industrial regions worldwide.

Q: If the model I need is not listed on the website, can I request a quote?
A: Yes. We hold over 200,000 SKUs of industrial spare parts in stock, and many long-tail models are not listed in full. You can send us an RFQ (Request for Quote) directly, and we will provide wholesale pricing promptly.

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