DO840 ABB S800 I/O Digital Output Datasheet & Technical Manual

ABB DO840 3BSE020838R1 S800 I/O Digital Output Unit

ABB DO840 3BSE020838R1 S800 I/O Digital Output Unit

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ABB DO840 S800 I/O Digital Output Module Configured for high-density signal switching in System 800xA and Advant OCS architectures, the...

SKU: DO840 3BSE020838R1

Manufacturer: ABB
Product No.: DO840 3BSE020838R1
Product Type: Digital Output Modules
Product Origin: Switzerland
Payment:T/T, Western Union
Weight: 200g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

ABB DO840 S800 I/O Digital Output Module

Configured for high-density signal switching in System 800xA and Advant OCS architectures, the ABB DO840 (3BSE020838R1) provides direct physical/electrical execution of 16-channel 24 VDC output control.

Hardware Specifications

Parameter	Specification
Model	DO840
Brand	ABB
Origin	Sweden
Weight	0.2 kg
Dimensions	119 x 45 x 102 mm
Operating Temp	-20 deg C to 55 deg C
Power Consumption	2.4 W
Output Channels	16 (two groups of 8)
Output Rating	24 V DC / 500 mA per channel
Redundancy	Supported (requires MTU TU842/TU843)

PLC Control and Deterministic I/O Scaling

The DO840 module incorporates internal logic that manages backplane bus communication velocity by synchronizing output state changes with the host controller scan cycle. Its I/O density scaling allows for efficient rack space utilization, supporting up to 16 channels within a standard 45 mm module width. The module firmware supports flash compatibility updates via the engineering station, enabling system-wide performance optimization without replacing physical hardware. When integrated into deterministic networks, the DO840 ensures that output state transition latencies remain within sub-millisecond tolerances, maintaining strict control loop timing.

Frequently Asked Questions

Q: Does the DO840 support hot-swapping during active process control?

A: Yes, the DO840 supports hot-swapping when mounted on a Module Termination Unit (MTU). However, ensure the secondary module in a redundant configuration is fully synchronized before removing the primary unit to prevent process output bumps.

Q: Can the two groups of 8 channels be powered by independent power supplies?

A: Yes. The module features group-to-group galvanic isolation, which allows for the use of separate power sources for each 8-channel group, facilitating flexible electrical design and fault containment.

Field Installation Guidelines

MTU Selection: Mount the appropriate Module Termination Unit (e.g., TU810 or TU842 for redundancy) onto the DIN rail before installing the DO840. Ensure the MTU is firmly locked to the rail to provide a stable mechanical and electrical interface.
Backplane Engagement: Slide the module into the MTU guides until the mechanical latch engages. This action connects the module to the I/O bus and power distribution rails; verify that the latch is secure to prevent intermittent contact.
Load Wiring: Connect field devices to the MTU terminals. To minimize inductive noise, use shielded cabling for high-speed switching of inductive loads like solenoid valves and ensure that freewheeling diodes are utilized where applicable to protect output drivers.
Diagnostic Monitoring: Utilize the front-panel LED indicators to verify module status. A steady signal indicates normal operation, while fault indicators provide immediate notification of short-circuit or over-temperature conditions detected by the internal monitoring circuitry.

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