Rockwell Automation T8449 Trusted TMR 24V dc Valve Monitor Module - 40 Channel - Manual (Page 17)

Trusted
TM
Module T8449
Issue 13 Apr 10 PD-T8449 17
Write the desired end state to the ESTATE signal.
Turn the TEST signal off (logic ‘0’). This will clear the results of the previous test (if any). The Valve
Test State will be reported as 0 (Idle). All other valve test variables (such as the Test Times, Sampled
ETIME, and Sampled ESTATE) will be cleared to 0.
Write 0 (Valve Test State) to the MXOUT signal.
Wait for the MXIN value to be 0 (Valve Test State). MXDAT should now contain the Valve Test State
which should be 0 (Idle).
Turn the TEST signal on (logic ‘1’). This will initiate the valve test.
Wait for the Valve Test State in MXDAT to read a value greater than 1 - either 2 (Test Complete), 3
(Test Error), 4 (Test Aborted), or 5 (Test Failure).
If the Valve Test State in MXDAT is 2 (Test Complete), collect the valve travel times.
Write 1 (Test Time 1) to MXOUT. Wait for MXIN to equal MXOUT.
Copy the value in MXDAT to a local variable. This is the time (in milliseconds) from the start of the test
until the positional feedback voltage level reached state 1.
Repeat 9 and 10 as necessary. You may want to collect one, some, or all of the Test Times depending
on the initial valve state, the configuration of the limit switches, and the voltage thresholds used.
Repeat from step 1 for each new valve test. Skip steps 1 and 2 only when ETIME and ESTATE remain
the same for each test.