ABB DO818 3BSE069053R1 S800 I/O Digital Output Module
The ABB DO818 3BSE069053R1, also cataloged as the DO818 Digital Output Module, operates as a dedicated hardware component for high-speed digital actuation within ABB S800 I/O platforms. The module converts ModuleBus control logic into 32 discrete 24 VDC transistor output channels arranged in two isolated groups of 16 channels, providing short-circuit proof physical execution for field loads.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | DO818 (3BSE069053R1) |
| Brand | ABB |
| Origin | Switzerland |
| Weight | 0.18 kg |
| Dimensions | 119 mm x 45 mm x 102 mm |
| Operating Temp | 0 to +55 deg C |
| Power Consumption | 3 W |
| Output Channels | 32 transistor outputs (2 groups of 16) |
| Nominal Voltage | 24 VDC |
| Max Output Current | 0.5 A per channel |
| ModuleBus Current | +5 VDC: ~100 mA; +24 VDC: ~50 mA |
| Dielectric Isolation | 500 VDC test voltage (50 V rated) |
| Diagnostic LEDs | Fault (F), Run (R), Output State (OSP), Channel indicators |
| Enclosure Rating | IP20 (IEC 60529) |
Backplane Bus Communication Velocity and Firmware Integration
The DO818 interface manages high-speed backplane bus communication velocity across the internal ABB ModuleBus network. Internal micro-logic draws approximately 100 mA from the +5 VDC backplane rail and 50 mA from the +24 VDC bus rail to continuously execute cyclic I/O scans. Channel-to-system and group-to-group galvanic isolation rated at 500 VDC shields backplane electronics from field-side inductive transients. Internal supervision circuits monitor output state execution and firmware flash integrity, initiating a safe state shutdown (OSP mode) if backplane communications experience frame losses or parity errors.
Frequently Asked Questions
Q: Which Module Termination Units (MTU) support physical mounting of the DO818 module?
A: The DO818 connects to standard S800 terminal base units, specifically the TU818, TU819, and TU830 MTUs, which route backplane ModuleBus lines and field wiring terminations.
Q: How does the short-circuit protection mechanism respond to overcurrent field faults?
A: Each output transistor incorporates electronic short-circuit protection that limits surge current and drives the front Fault LED, preventing thermal failure during field wire shorts.
Q: What is the backplane current load requirement for power distribution sizing?
A: The module draws 100 mA from the +5 VDC rail and 50 mA from the +24 VDC rail on the ModuleBus, with total internal thermal power dissipation capped at approximately 3 W.
Field Installation Guidelines
Verify that all power sources to the MTU and field terminals are de-energized prior to inserting or removing the DO818 unit. Align the module housing vertically with the mechanical MTU guide rails and press firmly until the locking mechanism engages to establish low-resistance ModuleBus contact.
Route 24 VDC field output wiring in separate cable trays from high-voltage AC conductors to prevent electromagnetic interference. Connect the DIN rail mounting frame directly to the master earth busbar, maintaining earth bonding impedance below 1 Ohm to satisfy IEC noise immunity standards.
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