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84 SMV 3000 Transmitter User’s Manual 1/99
7.4 Using Transmitter to Simulate PV Input
Using SMV
Transmitter in Input
Mode
You can use an SMV 3000 transmitter to simulate a PV input value
through the transmitter’s input mode. This feature is useful to check a
PV’s affect on the transmitter’s output and compare expected readings on
other analog instruments in the loop such as recorders, controllers, and
positioners. For SMV transmitters operating in DE mode, inputs can be
simulated for each PV to check the transmitter’s outputs on Universal
Station displays with our TPS/TDC systems.
Using the SCT, you can tell the transmitter to change a PV input to any
acceptable range value and maintain that input. This makes it easy to
check PV input operation through the accurate simulation of input signals.
This is especially helpful in verifying the affect of a given input on the
PV4 calculated flow rate output.
NOTE: The input mode overrides the output mode.
CAUTION
When the transmitter is in the input mode:
• The simulated PV input value is substituted for the measured input
• The output reflects the simulated input.
ATTENTION
For SMV transmitters that are digitally integrated with Honeywell’s
TPS/TDC systems, note that PV readings on Universal Station displays
will be flagged as BAD PV although the “PVRAW” reading will continue
to be displayed will reflect the simulated input.
Input Mode Procedure
The procedure in Table 21 outlines the steps for using the transmitter in its
input mode and clearing the input mode.
Table 21 Using SMV Transmitter in the Input Mode
Step Action
1
Connect SCT to SMV and establish communications. (See
Subsection 5.2 for procedure, if necessary.)
2
Be sure any switches that may trip alarms or interlocks associated
with analog loops are secured or turned off.
3
Perform Upload of the SMV database to the SCT.
4
For example purposes we want to simulate the PV1 input while
monitoring PV4 output.
Continued on next page