Siemens M200D Manual De Usuario
Diagnostics
7.3 Diagnostics via parameter channel (parameter echo)
M200D AS-Interface Basic
84
Manual, 03/2009, A5E01668085-01
7.3
Diagnostics via parameter channel (parameter echo)
Diagnostics (diagnostic message and diagnostic read procedure)
In the PLC, you can tell whether a fault has occurred by looking at the "I/O fault bit" (S1) on
the slave status tab page. The AS-i master enters the S1 value in the list of I/O faults (LPF)
that have been signaled. The PLC can read this list via the "GET_LPF" command and then
signal a specific diagnostic value from the slave.
Slave diagnostics echo (parameter echo)
Bit P0 defines whether a fault diagnosis (P0 = 1) or alarm/message diagnosis (P0 = 0) is
returned to the master as a slave response.
The parameter value (P0 = (0 / 1); P1 = x; P2 = x; P3 = x) is sent to the master via the
The parameter value (P0 = (0 / 1); P1 = x; P2 = x; P3 = x) is sent to the master via the
"Write_Parameter" command.
Note
In the parameter echo, only one fault or message is output at any one time; this is always the
In the parameter echo, only one fault or message is output at any one time; this is always the
one with the highest priority. No further messages/faults can be output while this
message/fault is present.
Call (master to slave):
P3
P3
P2
P1
P0
A/B
x (free)
x (free)
0
Feedback (slave to master):
Parameter echo – alarms (A) / messages (M)
P3
P3
P2
P1
P0
Decimal Message / alarm
0
0
0
0
00
No alarm / message
0
1
0
0
04
(M) Thermal motor model deactivated
1
0
1
0
10
(M) Manual local control
1
0
1
1
11
(A) Prewarning limit of motor model exceeded
1
1
0
0
12
(M) Temperature sensor deactivated