Diagnostics mes‐
sage
Error
code
Assignment Meaning Remedy
Retentive memo‐
ry in carrier mod‐
ule defective
154
H
Module A memory block error was detected on the
support module
Replace carrier module
Retentive memo‐
ry in the terminal
block defective
155
H
Module A memory block error was detected on the
terminal block
Replace terminal block
1
Only the terminal blocks (TB 45R ...) are suitable for use with I/O modules in IO redundancy.
A.5 Maintenance events
Maintenance events
A maintenance event is generated each time a maintenance requirement is identied. The MT
LED lights up on the module.
Maintenance messages are assigned either to one input on a channel-specic basis (HART error)
or to inputs as a module message aecting all inputs.
Maintenance messages have no direct eect on the function of the module or the analog value
acquisition. Maintenance events of the HART communication do not aect the analog value
acquisition of the module.
Table A-2 Maintenance messages, their meaning and possible remedies
Maintenance
message
Error
code
Assignment Meaning / Cause Remedy
Redundancy part‐
ner has dierent
hardware/rm‐
ware version
120
H
Module The redundantly congured and intercon‐
nected I/O modules are not compatible
Check and replace modules
IO redundancy
warning
121
H
Module Unable to correctly communicate with the
partner module
• Check/replace right module
• Check/replace left module
• Check/replace terminal
block
See also system manual Distrib‐
uted I/O System; ET 200SP HA",
section "Replacing an I/O mod‐
ule for I/O redundancy"
HART communica‐
tion error
141
H
Analog input
• HART eld device is not responding
• Timing error
• HART eld device did not understand the
command that was sent (1st status byte)
• Check the process wiring
• Correct the parameter as‐
signment
• Set current ≥4 mA
• Increase number of cong‐
ured repetitions
Parameters, diagnostics messages and address space
A.5 Maintenance events
AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB 65
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