Maintenance
message
Error
code
Assignment Meaning / Cause Remedy
Retentive memo‐
ry in carrier mod‐
ule defective
154
H
Module Fault detected in the data block on the carrier
module during operation
Replace carrier module
Retentive memo‐
ry in the terminal
block defective
155
H
Module A memory block error was detected on the
terminal block during operation
Replace terminal block
1
Response of the HART conguration changed maintenance message
If the HART eld device signals "parameter reassignment" (conguration changed) in the 2nd
status byte, the module generates the maintenance message "HART conguration changed". If
the eld device withdraws the message in the 2nd status byte within a minute, the maintenance
message is also deleted again by the module. If the message in the 2nd status byte is still set after
a minute, the module then independently sends HART command 38 for resetting the message
in the eld device.
A.6 Hardware interrupts
Hardware interrupts
The I/O module can initiate hardware interrupts when limit violations of analog input signals
occur.
Interrupt OBs are called automatically if an interrupt occurs.
You can nd detailed information on the event in the hardware interrupt organization block with
the "RALRM" instruction (read additional interrupt information).
The module generates a hardware interrupt at the following events:
• Violation of the low limit 1
• Violation of the high limit 1
• Violation of the low limit 2
• Violation of the high limit 2
The module analog input (channel) that has triggered the hardware interrupt is entered in
variable OB40_POINT_ADDR in the start information of OB40. The gure below shows the
assignment to the bits of local data double word 8.
Parameters, diagnostics messages and address space
A.6 Hardware interrupts
AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB 67
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