Flowserve 400MD Logix - Manual (Page 42)

• Calibration Auto: allows the user to specify the auto calibration (default) or to enter into a job calibration mode.
LX_SPI_STATUS_FLAGS Should a loss of communications occur between the fieldbus card and positioner card this parameter sets the fail mode
of the valve. Nothing selected will cause the positioner to hold the last known command should a loss of communications occurs.
STROKE_TIME_UP: Allows the user to limit the stroking speed of the positioner. Input the number of seconds for the desired opening stroke
speed. Disable this feature by writing 0 to the variable.
STROKE_TIME_DN: Allows the user to limit the stroking speed of the positioner. Input the number of seconds for the desired closing stroke
speed. Disable this feature by writing 0 to the variable.
CURVE_SELECT: This parameter allows the user to select what type of characterization curves the positioner will use. The selections are Equal
Percent, Quick Open, or Custom. If Custom is selected, the parameters CURVEX and CURVEY must be initialized.
NVRAM_WRITE_CYCLES: This is a diagnostic parameter that allows the user to monitor the number of times the NVRAM is written to. This
can be a useful diagnostic tool for checking if the host system is writing to the Fieldbus board memory too often. This is often a configura-
tion error in the host system setup. Excessive write cycles can cause configuration upsets and possible communications slowdowns and
errors. It also will shorten the operational life of a Fieldbus device by exceeding the finite number of write cycles NVRAM chips can be used
reliably to. These devices typically have a minimum 10,000,000 write cycle endurance. Even though this is a very high number that would typically
never be reached during the operational life of the device, a misbehaving host configura tion routing could drive up the number of write cycles very quickly,
and should be corrected as all devices in the configuration will be adversely affected by this continuous download.
8.7 MD Transducer Block
The MD Transducer block contains the parameters used by the advanced and pro model of the Logix 3400MD. These parameters are used for
diagnostics and error detection of the system.
Table 8.8 Transducer Block Parameters
Index Origin Name Store Date Type Default Value
0 STND XDTB_MD SRW Record BLOCK 0
1 STND ST_REV SR Simple UNSIGNED16 1
2 STND TAG_DESC SRW Simple OCTET_STRING “7 “
3 STND STRATEGY SRW Simple UNSIGNED16 2
4 STND ALERT_KEY SRW Simple UNSIGNED8 4
5 STND MODE_BLK SRW Record MODE 0x01;0x01;0x11;0x10
6 STND BLOCK_ERR R Simple BIT_STRING 0
7 STND UPDATE_EVT RW Record ALARM_EVENT 0;0;0,0;0;0;0;0
8 STND BLOCK_ALM RW Record ALARM_DISC 0;0;0,0;0;0;0;0;0;0
9 STND TRANSDUCER_DIRECTORY NR Array UNSIGNED16 0
10 STND TRANSDUCER_TYPE NR Simple UNSIGNED16 106
11 STND XD_ERROR R Simple UNSIGNED8 0
12 STND COLLECTION_DIRECTORY NR Array UNSIGNED32 0
13 MFG LD_MD_MODE R Simple UNSIGNED8 0
14 MFG MECHANICAL_STATUS R Simple BIT_STRING 0
15 MFG MECHANICAL_MASKING NRW Simple BIT_STRING 0
16 MFG VALVE_TRAVEL_DISTANCE R Simple FLOATING_POINT 0
17 MFG VALVE_TRAVEL_HIGH_START RW Simple FLOATING_POINT 0
18 MFG VALVE_TRAVEL_HIGH_END RW Simple FLOATING_POINT 0
19 MFG VALVE_TRAVEL_PERCENT_YELLOW NR Simple FLOATING_POINT 0
20 MFG VALVE_CYCLE_COUNT R Simple UNSIGNED32 0
21 MFG VALVE_CYCLE_HIGH_START RW Simple UNSIGNED32 0
22 MFG VALVE_CYCLE_HIGH_END RW Simple UNSIGNED32 0
23 MFG VALVE_CYCLE_PERCENT_YELLOW NR Simple FLOATING_POINT 0
24 MFG PST_TIME_BREAKAWAY NR Simple FLOATING_POINT 0
25 MFG PST_PRESSURE_DIFF R Simple FLOATING_POINT 0
Logix 3400MD Digital Positioner LGENIM3405-02 11/13
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