Maintenance messages do not have a direct influence on the functions of the module or digital
inputs.
Maintenance
message
Fault code Assignment
Meaning / Cause
Solution
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 fault on the terminal
block was detected during operation
Replace terminal block
A.5
Hardware interrupts
Hardware interrupts
The DI 8x24…125VDC HA can trigger hardware interrupts on a signal change of digital inputs.
Interrupt OBs are called automatically if an interrupt occurs.
You can find detailed information on the event in the hardware interrupt organization block with
the "RALRM" instruction (read additional interrupt information).
Evaluate hardware interrupts of digital inputs
On occurrence of the following events the DI 8x24…125VDC HA generates a hardware interrupt
for digital input signals:
● At positive edge (change of signal from 0 to 1)
● At negative edge (change of signal from 1 to 0)
The module digital input (channel) that has triggered the hardware interrupt is entered in
variable OB40_POINT_ADDR in the start information of OB40. The figure below shows the
assignment to the bits of local data double word 8.
86,+LJK7HLO
86,/RZ7HLO
.DQDOGHUGHQ3UR]HVVDODUPDXVJHO
¸
VWKDW
+
.DQDOGHV3HULSKHULHPRGXOV
+
.DQDOGHV3HULSKHULHPRGXOV
+
.DQDOGHV3HULSKHULHPRGXOV
+
.DQDOGHV3HULSKHULHPRGXOV
+
.DQDOGHV3HULSKHULHPRGXOV
+
.DQDOGHV3HULSKHULHPRGXOV
+
.DQDOGHV3HULSKHULHPRGXOV
+
.DQDOGHV3HULSKHULHPRGXOV
)HKOHUHUHLJQLVGDVGHQ3UR]HVVDODUPDXVJHO
¸
VWKDW
+
VWHLJHQGH)ODQNH
+
IDOOHQGH)ODQNH
%LW1U
/%
/%
/%
/%
/'
;
;
;
;
;
Parameters, diagnostics messages and address space
A.5 Hardware interrupts
DI 8x24...125VDC HA
Equipment Manual, 10/2021, A5E39288633-AD
39
