Alarm Mode Write: W - Omron E5ZD Operation Manual

Temperature Control Commands (All Controllers)
End Codes
Precautions
4-2-13

Alarm Mode Write: W#

88
header code of IC will be returned without an end code (see Section 4-1-2 End
Codes for the IC header code response format).
@ 0 Unit A
Header code
(AS or AP, depending on
the command used.)
If an end code of 00 was returned in the response, the command was executed
normally. If the end code is not 00, the command will not have been executed.
Refer to Section 4-1-2 End Codes for a description of the other possible end
codes and their meanings.
Although autotuning can be executed for either heating or cooling operation and
during startup, temperature rise, or stable operation, best results will be
achieved if autotuning is executed under normal operating conditions, including
the actual set temperature (PID constants will vary with the set temperature).
Autotuning will not end if executed without an active controlled system, e.g.,
without a heater connected or without the heater being turned on.
Autotuning can require ten or more hours to complete under certain conditions.
If extensive time is required, try setting the P constant to zero and then restart
autotuning.
Autotuning will not achieve optimum PID constants for all controlled systems. If
autotuning does not achieve satisfactory results, set PID constants manually.
Hunting can result during autotuning because a limit cycle is used. If hunting is
undesirable for the controlled system, set PID constants manually.
Autotuning must be restarted if a power interruption occurs.
Sequential activation of autotuning is possible by using a 01 data code. Autotun-
ing will start from the smallest numbered point that is active and continue to the
next active point when autotuning finishes for the previous point.
The HB and HS alarms will not work for points that are being autotuned.
The values of fuzzy scales 1 and 2 will be automatically adjusted according to
the PID constants that have been determined by autotuning. The values of fuzzy
scales 1 and 2 can be manually set after the PID constants have been set if dif-
ferent values are desired.
This command is used to set the operating modes for alarm outputs 1 and 2. The
modes for these outputs are set independently and can differ. The alarm out-
puts, however, will be turned ON whenever an error exists for any active point.
The alarm mode can only be set when the specified control point is not operat-
ing. If it is operating (or autotuning), an error will result and a 01 end code will be
returned. An alarm will not function unless the relevant point is operating.
End code FCS
Section 4-2
CR
*
Terminator