ABB-listed MTUs
TU810, TU812, TU814, TU818, TU830, TU833, TU835 and TU838. The hardware-selector keying code is CC.
HART Input Overview
ABB AI815 accepts supported current or voltage signals as one group of eight inputs isolated from ground. The complete module is configured for one signal family; current and voltage cannot be mixed. For transmitter loops, it distributes and supervises an external HART-compatible supply with per-channel current limiting.
Verified HART & Electrical Data
01Identity & Package5 items
Model / article number
AI815 / 3BSE052604R1
Product type / mechanics
Analog input / S800
Current / voltage mixing
Not permitted on the same module
Under-range / over-range
0 / +15% for 0–20 mA and 0–5 V; −12.5% / +15% for 4–20 mA and 1–5 V
Maximum field cable length
600 m (656 yd)
02Function & Performance8 items
Number of channels
8
Signal ranges
0–20 mA, 4–20 mA, 0–5 V, 1–5 VDC
Signal type
Unipolar, single-ended
Resolution
12 bit
Input impedance
10 MΩ voltage input; 250 Ω current input
Input filter, 0–90% rise time
290 ms
Update cycle
10 ms
HART / SOE / redundancy
Yes / No / No
03Interfaces & Power4 items
Transmitter power
Built-in current limiting; external HART-compatible supply distributed to channels
Power dissipation
3.5 W
ModuleBus current
100 mA at +5 V; 50 mA at +24 V
External 24 V consumption
265 mA maximum: 22 mA + 1.32 × transmitter current
04Diagnostics & Environment12 items
Channel grouping / isolation
1 group of 8; groupwise isolated from ground
Maximum error
0.1%
Temperature drift
50 ppm/°C maximum
Normal-mode rejection, 50/60 Hz
>40 dB
Rated insulation / dielectric test
50 V / 500 VAC
Module diagnostics
Analog readback, reference voltage, internal supply, checksum, watchdog and memory supervision
External channel diagnostics
External supply low and transmitter-power error
High Integrity / intrinsic safety
No / No
Operating / storage temperature
0 to +55 °C / −40 to +70 °C
Protection / corrosion class
IP20 / ISA-S71.04 G3
Dimensions (W × H × D)
45 × 119 × 102 mm; 111 mm deep including connector
Weight
0.23 kg
System Fit & HART Hardware
Freelance and S800 context
ABB lists AI815 in S800 remote I/O for Freelance and identifies HART pass-through as a configuration and diagnostic benefit of the S800 arrangement.
The reviewed ABB sources do not name a direct replacement. Do not
substitute AI810 or another eight-channel analog module without
checking ranges, HART pass-through, transmitter-power distribution,
diagnostics and MTU keying.
HART Loop Fault Patterns
HART transmitter loops
Acquire 4–20 mA process signals while preserving HART pass-through for the applicable device-management workflow.
Powered 2-wire or 3-wire transmitters
Use the distributed external HART-compatible supply where the loop design matches ABB wiring and load requirements.
HART communication unavailable
Check that the module is configured for current, the external supply is HART-compatible, the loop wiring is intact and the control-system HART path is enabled.
Channel power error
Review external supply voltage, per-channel transmitter load and short-circuit conditions. The module reports low external supply and transmitter-power errors.
HART Commissioning Notes
01Choose one signal family
Configure the complete module for current or voltage; do not mix them.
02Validate the supply
Use an external HART-compatible transmitter supply for HART loops.
03Check the MTU
Confirm an ABB-listed MTU, CC keying and the correct field termination.
04Commission both paths
Verify the analog value and HART pass-through, then review channel diagnostics.
A correct 4–20 mA value does not by itself prove the HART path.
Check the supply, field device, module configuration and
system-level routing.
HART Project Support
One accountable contact
Keep HART supply and MTU details with the request
Send the part number, quantity, destination, date and loop context.
- Identity and available checks stated on the quote
- Protective packing and DOA reporting process
- Return and warranty terms confirmed before order
ABB HART Reference Index
- ABB Compact Product Suite Hardware Selector — AI815Version 6.2 | Article 3BSE052604R1Open official ABB source
- ABB S800 Remote I/O for FreelanceOfficial S800 system page | Live revisionOpen official ABB source
- ABB S800 I/O MTU Hardware SelectorOfficial termination-unit compatibility outline | Live revisionOpen official ABB source
Multi-brand Spare Parts Also Requested
6L-E4-C1A-RR449D701G07CU13S-11SAT-101BX593CM-BOV16810-E440582/2CB273 42185-800-01BF100F 65A974G019125DAV1955565-E6EC1660-3ACLV440-0010809-112MSQB30R MHZL2-25DDU321CSC4TD4BL-K3TS500RF39-A01POG-DVS5M-1A-GBT-68-GDMJB-00-801 MJB-IN-V1.03467030 3 PP T-15CMD 126553LPC50-0025TM1-P2AAV1028BC-8/133-0 UL1028151D995G1151DP3E12B29070-K50-D5C1608X5R0J475MT000N
These part numbers are independent purchasing references only. They are not replacements for AI815. Compatibility and stock must be confirmed separately for each item.
AI815 HART FAQ
Can AI815 mix current and voltage channels?
No. ABB states that current and voltage signals cannot be mixed on the same module.
Does AI815 support HART communication?
Yes. ABB identifies HART pass-through. The external supply used for HART transmitters must also be HART-compatible.
How does AI815 power field transmitters?
The module distributes an external transmitter supply to each channel, supervises it and applies current limiting per channel.
Which MTUs are listed for AI815?
ABB lists TU810, TU812, TU814, TU818, TU830, TU833, TU835 and TU838. The keying code is CC.
What diagnostics can identify an AI815 loop-power problem?
The module reports low external supply and transmitter-power errors. It also supervises analog readback, reference voltage, internal supply, checksum, watchdog and memory.
What should an RFQ for AI815 include?
Provide the full part number, quantity, destination, required date and machine or system model. Add the installed MTU, signal range, transmitter type and HART requirement if known.
RFQ for AI815
For a faster technical and commercial check, send the installed-part details together with the required date.
Email Miya Zheng- Part Number
- Quantity
- Destination
- Required Date
- Machine / System Model
