Rockwell Automation T8449 Trusted TMR 24V dc Valve Monitor Module - 40 Channel - Manual (Page 28)

Trusted
TM
Module T8449
Issue 13 Apr 10 PD-T8449 28
3.2.6. Rack 6: ETM_EST
This board provides connections to the ETIME and ESTATE signals for each field device.
Channel
Field
Device
Description
1 End Time for valve test
2
1
End State for valve test
3 End Time for valve test
4
2
End State for valve test
39 End Time for valve test
40
20
End State for valve test
Table 12 rack 6: ETM_EST descriptions
The ETIME signal is used to specify the maximum amount of time that a valve test is allowed to
continue before returning the valve to its commanded state. ETIME is specified in milliseconds, and
may be any value between 0 and 32767. Values outside the valid range will be set to 0. Because a
non-zero value (i.e. 1 < value < 32767) must be specified before a value test can be initiated, setting
ETIME to 0 inhibits valve testing.
The ESTATE signal is used to specify the desired end state for the feedback input for a valve test. The
possible end states correspond to the values reported for feedback input state on the State board
(Rack 2) and must be between 0 and 6. Values outside the valid range will be set to 0. Because a non-
zero value (i.e. 1 < value < 6) must be specified before a valve test can be initiated, setting ESTATE to
0 inhibits valve testing.
Both ESTATE and ETIME are sampled by the module when it detects a rising edge on the TEST signal
(Rack 1). Changes to ETIME or ESTATE during a valve test are valid, but will not go into effect until
the start of the next valve test (i.e. on the next rising edge of the TEST signal).