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ABB DI825 Digital Input Module

The ABB DI825 3BSE008552R1, also cataloged as the DI825 Digital Input Module, provides 48 VDC discrete signal acquisition for S800 I/O systems through isolated input channels and ModuleBus diagnostics.

Hardware Specifications

Parameter	Specification
Model	DI825 3BSE008552R1
Brand	ABB
Origin	Sweden
Weight	0.15 kg
Dimensions	45 mm W x 102 mm D x 119 mm H
Operating Temp	0 to +55 deg C
Power Consumption	Typ. 2.7 W
Product Type	Digital Input Module
Series	S800 I/O
Signal Specification	48 VDC
Number of Channels	16
Signal Type	Current sinking
Input Voltage Range "0"	-60 to +10 VDC
Input Voltage Range "1"	30 to 60 VDC
Input Current	4 mA at 48 VDC
Input Impedance	11 kOhm
Isolation	Two isolated groups with 8 channels each
Filter Times	2 ms, 4 ms, 8 ms, 16 ms selectable
Maximum Field Cable Length	600 m
Rated Insulation Voltage	50 V
Dielectric Test Voltage	500 VAC
ModuleBus Current Consumption +5 V	50 mA
ModuleBus Current Consumption +24 V	0
External +24 V Current Consumption	0
HART Support	No
SOE Function	No
Redundancy Support	No
High Integrity Function	No
Intrinsic Safety	No
MTU Compatibility	TU810, TU812, TU814, TU818, TU830, TU833, TU838, TU850
Keying Code	BD
Protection Class	IP20 according to IEC 60529
Relative Humidity	5 to 95 %, non-condensing
Storage Temperature	-40 to +70 deg C
EMC Standard	EN 61000-6-4 and EN 61000-6-2
Safety Standard	EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
RoHS Compliance	EU RoHS, UAE RoHS, CN RoHS

ABB S800 I/O Backplane and I/O Density Characteristics

The DI825 operates within the ABB S800 I/O platform and communicates through the ModuleBus interface. The module uses ABB backplane bus communication architecture to transfer diagnostic states and input data between field channels and the controller system.

Furthermore, the module structure supports I/O density scaling by providing 16 digital input channels in a compact S800 form factor. Each input channel includes current limiting components, EMC protection components, LED status indication, and an optical isolation barrier.

The input channels are arranged into two electrically isolated groups. Each group contains eight channels and one process voltage supervision input. Therefore, the module can detect loss of field supply voltage and report channel-related error conditions through the ModuleBus diagnostic system.

Frequently Asked Questions

Q: How does the DI825 handle input channel isolation?
A: The DI825 uses two individually isolated input groups, with eight channels in each group. Each input channel includes an optical isolation barrier and EMC protection components.

Q: What diagnostic information is available through ModuleBus?
A: The module provides module error, module warning, and channel error status. Process voltage supervision signals are transferred through the ModuleBus interface.

Q: Can the DI825 operate with redundant configurations?
A: No. The DI825 is specified as a non-redundant digital input module for S800 I/O applications.

Field Installation Guidelines

Install the DI825 module using a compatible ABB S800 MTU according to the selected terminal configuration. Verify that the TU810, TU812, TU814, TU818, TU830, TU833, TU838, or TU850 MTU matches the module keying code before installation.

Route field signal cables separately from high-voltage power conductors to reduce electromagnetic interference. Connect cable shielding according to the site grounding practice and applicable EMC installation requirements.

Confirm the 48 VDC field supply polarity before energizing the input circuits. Check the front LED indicators after startup to verify module operation, channel states, and process voltage supervision status.

Avoid exceeding the specified field cable length and environmental limits. Maintain enclosure protection requirements to preserve the IP20 installation rating.

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