User's Manual

PL-550 32
OPERATION
Fail-safe
When the fail-safe timer (P070) expires, the mA output responds as follows:
Fail-safe Mode (071) Status
0/4 - 20 20 - 0/4
high 22 0/2
low 0/2 22
hold hold hold
RUN / PROGRAM
When the IQ Radar 160 changes from run to program , the transceiver stops
operating and the unit no longer responds to the process. The last measurement
is stored and the associated reading and mA output are held.
As a courtesy, the unit reverts to the parameter last addressed during the previous
program session.
Upon return to run , the transceiver resumes operation. The reading and mA
output default to the last measurement taken. The reading and associated
outputs migrate to the current process level at a rate controlled by the
measurement response (P003).