OPC90 Server
OUT_LO_LIM VT_R4 Read/Write OUT low limit (see note 3).
RED_CMD VT_BSTR Read/Write Red tag command (see red tag users
section).
RED_TAG VT_BOOL Read Red tag indicator (0 – no, 1 – yes).
RED_USERS VT_BSTR Read Red tag users (current user names or codes).
HI_ACT VT_BOOL Read PV High alarm active indicator.
LO_ACT VT_BOOL Read PV Low alarm active indicator.
PV_HI_LIM VT_R4 Read PV high limit.
PV_LO_LIM VT_R4 Read PV low limit.
HI_LIM VT_R4 Read/Write The setting for the alarm limit used to detect
the PV high alarm condition.
LO_LIM VT_R4 Read/Write The setting for the alarm limit used to detect
the PV low alarm condition.
DV_LIM VT_R4 Read/Write PV Deviation limit.
DV_HI_ACT VT_BOOL Read High deviation alarm active indicator.
DV_LO_ACT VT_BOOL Read Low deviation alarm active indicator.
KFAST VT_BOOL Read/Write Indicates PID/SMITH STN block is in fast
update mode (see note 5).
KGET VT_BOOL Read/Write Setting this tag requests an immediate read of
the PID/SMITH tuning parameters (K tags). It
is automatically reset when the read has been
completed. This tag cannot be set until after
the STN block PID/SMITH function code
(.KFC) has been determined.
KFC VT_R4 Read PID/SMITH function code number.
KTYPE VT_BSTR Read PID/SMITH type informational string.
KDIR VT_R4 Read/Write PID direction switch (see note 4):
0 = reverse acting, SP - PV
1 = direct acting, PV – SP
or SMITH predictor external reference flag
which can not be written:
0 = normal
1 = use external reference
KIONLY VT_R4 Read/Write PID set point modifier (see note 4):
0 = normal
1 = integral only on set point change
K VT_R4 Read/Write Overall PID block gain term or SMITH
predictor process model gain (see note 4).
KP VT_R4 Read/Write PID block proportional gain value (see note
4).
KI VT_R4 Read/Write PID block integral action time constant or
SMITH Predictor controller tuning time
constant (see note 4).
KD VT_R4 Read/Write PID block derivative action time constant or
SMITH Predictor process model deadtime
(see note 4).
KDLAG VT_R4 Read/Write Advance PID (only) block derivative lag action
time constant or SMITH Predictor process
model lag time constant (see note 4).
AO_BYPASS VT_BOOL Read Analog output bypass indicator.
DS_BAD VT_BOOL Read Analog output associated with Digital station
(hard DCS station) bad indicator (see note 6).
Notes:
The RoviSys Company Version 7.0 Page 116
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