TECHNICAL DATA
Technical Specifications
TU840 is an ABB S800 I/O termination unit used in a redundant TB840 arrangement. Replacement planning must preserve the paired configuration, connection identity and redundancy path rather than treating the unit as a standalone terminal block.
FUNCTION
Termination for redundant I/O arrangement
INTERFACE
Used with TB840 configuration
I/O FAMILY
ABB S800 I/O
SYSTEM ROLE
Supports redundant field I/O assembly
INSTALLATION
Cabinet-mounted wiring interface
REPLACEMENT FOCUS
Redundancy path and connection identity
PRODUCT DETAILS
Product Image Display
MODULE LABEL REFERENCE
Confirm the complete identification
Confirm TU840 and TB840 identifiers on both sides of the redundant assembly.
Match the connected hardware
Label primary and redundant connections before disconnection.
Record field wiring and settings
Compare cable and ModuleBus routing with the cabinet drawing.
Plan the commissioning test
Verify redundancy status and diagnostics after the hardware change.
BEFORE REPLACEMENT
Replacement Checks Before Shutdown
CHECK 1
Confirm TU840 and TB840 identifiers on both sides of the redundant assembly
Confirm TU840 and TB840 identifiers on both sides of the redundant assembly.
CHECK 2
Label primary and redundant connections before disconnection
Label primary and redundant connections before disconnection.
CHECK 3
Compare cable and ModuleBus routing with the cabinet drawing
Compare cable and ModuleBus routing with the cabinet drawing.
CHECK 4
Verify redundancy status and diagnostics after the hardware change
Verify redundancy status and diagnostics after the hardware change.
TECHNICAL ANSWERS
Frequently Asked Questions
What is TU840 intended for?
It provides termination for an ABB S800 I/O redundant TB840 configuration.
Can one side be rewired without checking the pair?
No. The complete redundant arrangement and connection identity should be verified first.
What is the key post-installation test?
Confirm communication, redundancy switchover indication and absence of channel diagnostics.
Which details should be recorded before the existing TU840 is removed?
Record the full label code, connected module or terminal hardware, channel-to-terminal mapping, field-supply details and the cabinet location. Photographs should support, not replace, the approved wiring drawing.
What should technicians verify during commissioning?
Check power and diagnostics first, then prove each affected channel from the field side to the control-system indication or output. Confirm scaling, polarity, alarms and redundancy behavior where applicable.
What information is needed to confirm the correct replacement?
Provide clear label photos, the complete model and suffix, associated I/O or terminal-unit code, quantity, destination and any required certificates. Do not order from the base model alone.
CONTACT
Confirm TU840 Before Ordering
Send the complete label code, connected hardware, quantity and destination for a practical configuration review.
SALES CONTACT
Myrtle
Myrtle
WHATSAPP
+86 18950128464
+86 18950128464
EMAIL
sales5@askplc.com
sales5@askplc.com
ABOUT PLCEXPORT
Configuration review for TU840
Sales and sourcing teams review the requested model, connection hardware, quantity and destination details before dispatch planning.
RELATED REFERENCES
Recommended Models
Reference groups are unique to this product page. Confirm compatibility independently; model similarity does not establish interchangeability.
Siemens Product References
Siemens automation references for maintenance searches and catalog navigation; they are not direct substitutes for TU840.
6ES7534-7QE00-0AB0
6ES7540-1AB00-0AA0
6ES7551-1AB00-0AB0
6ES7590-1AE80-0AA0
6ES7523-1BL00-0AA0
6ES7417-4HL04-0AB0
6ES7531-7NF10-0AB0
6ES7531-7PF00-0AB0
6ES7515-2RN03-0AB0
6ES7517-3HP00-0AB0
6ES7518-4JP00-0AB0
6ES7521-1BH10-0AA0
6ES7521-1BL00-0AB0
6ES7518-4FP00-0AB0
6ES7518-4AX00-1AC0
6ES7518-4FX00-1AC0
Allen-Bradley Product References
Allen-Bradley controller and I/O references for cross-brand maintenance searches; confirm platform and wiring independently.
1769-OF8C
5069-L340ERM
5069-IB16
5069-OB16
1395-A65N-C1-PZ
SP-151140
81000-199-53-R
1756-TBCH
1756-L84E
1734-OB4E
1794-IM8
1763-L16BWA
1756-OA16
1746-NIO4V
1746-ITB16
1756-L55M22
Other PLC & DCS Brands
Additional controller and I/O references from other automation brands; no cross-brand item should be treated as a pin-compatible replacement.
WAGO 750-430
WAGO 750-530
Beckhoff EL1008
Beckhoff EL2008
Fatek FBs-20MN
Fatek FBs-32MN
Fatek FBs-44MN
Fatek FBs-24XY
Haiwell H16S2T-e
Haiwell H16S0P-e
Haiwell H16S2P-e
Haiwell H24S2R-e
Horner HE-XE1E6
Horner HE-XC1E2
Horner HE-X2A
Horner HE-X2R
Unitronics USC-B10-RA28
Unitronics USC-B10-T42
Unitronics USC-B10-TA30
Unitronics USC-B10-TR22
ODOT CT-3734
ODOT CT-3744
ODOT CT-4154
ODOT CT-4158
SIGMATEK RO 041
SIGMATEK RO 051
SIGMATEK AI 022
SIGMATEK AI 022-1
ICP DAS LP-5231
ICP DAS WP-2241-CE7
ICP DAS LP-2241
ICP DAS WP-5000
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