Configured for 32-channel isolated digital signal acquisition in S800 I/O architecture, the ABB MDI32BIS (MDI32BIS Digital Input Module) provides direct physical/electrical execution. This high-density module converts external 24 VDC binary field signals into internal logical backplane states, enabling real-time status monitoring, event recording, and high-speed process sequencing across ABB System 800xA control networks.

Technical Identifier Matrix

Hardware Specifications

DCS Backplane Bus Velocity and I/O Density Scaling

The MDI32BIS communicates across the ModuleBus backplane interface, utilizing high-velocity serial communications to deliver high channel-density updates directly to the Fieldbus Communication Interface (FCI) or AC 800M controller. Packed with 32 isolated digital channels, the module maximizes rack density while supporting high-speed pulse processing up to a 10 kHz switching frequency. Built-in +/-60 V DC overvoltage protection circuits buffer the internal logic against voltage spikes and field-wiring faults, maintaining system scan determinism and bus signal integrity across distributed network topologies.

Package Contents & Ordering Information

• 1x ABB MDI32BIS Digital Input Module
• 1x Factory Quality Inspection Certificate
• 1x Installation Safety Instruction Sheet

Field Installation Guidelines

• Module Mounting: Snap the module onto the corresponding S800 Extended Modulebus Items (MTU) until the retention latches lock securely into place.
• Wiring Configurations: Connect 24 VDC field discrete inputs to the dedicated MTU terminal blocks using stranded conductors from AWG 22 to AWG 14.
• Overvoltage & Isolation Safety: Verify that field input lines stay within the +/-60 V DC overvoltage protection limits to prevent destruction of internal optocouplers.
• Shielding & Grounding: Terminate field cable shields to the nearest MTU grounding bar. Ensure frame ground (FG) earth path resistance is maintained under 100 ohms with a 360-deg braid clamp assembly.

Frequently Asked Questions

• What is the channel capacity and input type for the MDI32BIS?

  The MDI32BIS provides 32 isolated digital input channels configured to process binary DC field status signals.

• What is the maximum switching frequency supported per channel?

  Each channel supports high-speed digital state changes up to a maximum switching frequency of 10 kHz.

• What overvoltage protection rating does the input channel possess?

  The module includes integrated input protection rated for continuous or transient overvoltages up to +/-60 V DC.

• What operating temperature range is the module rated for?

  The module operates within an ambient field temperature range of -25 deg C to +60 deg C without derating.

• Does the MDI32BIS support hot-swapping under live power?

  Yes, when installed on an appropriate S800 MTU baseplate, the module can be replaced under live power without disturbing adjacent I/O modules.

• What backplane architecture does this module interface with?

  The MDI32BIS connects directly to the ABB S800 ModuleBus backplane via dedicated Modular Terminal Units.

• What are the proper cable shielding requirements for installation?

  Digital input lines require shielded cabling terminated to the system grounding bar using 360-deg braid grounding with resistance under 100 ohms.

• Is channel-to-system galvanic isolation built into the module?

  Yes, input channels feature optocoupler galvanic isolation to isolate field surge transients from the central backplane logic bus.