Flowserve 3400IQ Digital Positioner - Manual (Page 54)

Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
4
Fail-safe Handling
The fail-safe parameters determine the response of an output block to the following conditions.
FSTATE_TIME is the number of seconds without communication or with Initiate Fail Safe at the
CAS_IN status, required to put this block into the fail safe state. The FAULT_STATE parameter of the
resource block may also put this block into the fail safe state. The Failsafe Type I/O option determines
whether the action is simply to hold, or to move to FSTATE_VAL.
The Target to Manual if IFS I/O option may be used to latch the fail safe state when IFS appears in the
CAS_IN status. This will cause a fail-safe block alarm. After the cause of the IFS status is removed,
the target mode may be returned manually to CAS mode when it is safe to do so.
AO Block Parameter List
Table 8.7 lists the block parameters and default values for the AO function block.
Table 8.7 AO Function Block Parameter List
Block
Index Name Store
Type Data Type
(Units) Valid
Range Write Restrictions Default Value
1 ST_REV S Unsigned16 Read Only 0
2 TAG_DESC S Octet String All spaces
3 STRATEGY S Unsigned16 0
4 ALERT_KEY S Unsigned8 0
5 MODE_BLK Mix MODE_BLK Target = OOS
Permitted = OS + MAN
+ AUTO + CAS + RCAS
Normal = AUTO
6 BLOCK_ERR D Bit String Read Only
7 PV D ANALOG (PV) Read Only
8 SP N ANALOG (PV) PV_SCALE,
+/- 10%
Target mode must be AUTO,
CAS or RCAS, not permitted
during cascade initialization,
tracking cannot be operative.
9 OUT N ANALOG (XD) XD_SCALE,
+/- 10%
Target mode must be Man
or OOS
10 SIMULATE D SIM_FLOAT Enable = OFF
11 PV_SCALE S SCALING Actual mode must be Man
or OOS
0 – 100
12 XD_SCALE S SCALING Actual mode must be Man
or OOS
0 – 100
13 GRANT_DENY D ACCESS_
PERM_T
14 IO_OPTS S Bit String Target mode must be OOS 0
15 STATUS_OPTS S Bit String Target mode must be OOS 0
16 READBACK D ANALOG (XD) Read Only
17 CAS_IN N ANALOG (PV)
18 SP_RATE_DN S Float (PV /
seconds)
Positive +INF
19 SP_RATE_UP S Float (PV /
seconds)
Positive +INF
20 SP_HI_LIM S Float (PV) PV_SCALE,
+/- 10%
100
21 SP_LO_LIM S Float (PV) PV_SCALE,
+/- 10%
0
22 CHANNEL S Unsigned16 Must be 1 Target mode must be OOS 0
23 FSTATE_TIME S Float (seconds) Positive 0
24 FSTATE_VAL S Float (PV) PV_SCALE,
+/- 10%
0
25 BKCAL_OUT D ANALOG (PV) Read Only
26 RCAS_IN N ANALOG
(PV)
27 SHED_OPT S Unsigned8 1 to 8 0
28 RCAS_OUT D ANALOG (PV) Read Only
29 UPDATE_EVT D EVENT
30 BLOCK_ALM D ALARM_
DISCRETE
32 WSP* D ANALOG (PV)