User's Manual

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
"Write_Parameter" command.
Note
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 P2 P1 P0
A/B x (free) x (free) 0
Feedback (slave to master):
Parameter echo – alarms (A) / messages (M)
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