RoviSys OPC90 - Output Station Control (Ostn)

OPC90 Server
7.23 Output Station Control (OSTN)
The OSTN OPC90 block interfaces with Bailey consoles as a Bailey Station block
(function codes 21, 22, 23, & 80). Note that this block does not received data
from a STN block running in a Bailey controller. Use the OPC90 STN block for
that purpose. The OSTN is used to indicate control of an analog PID control
loop. The operating mode of the PID control loop can be reported as manual
(operator writes the set point and control output values), auto (operator writes the
set point value with the control output calculated by the PID algorithm) or
cascade (logic determines the set point value with the control output calculated
by the PID algorithm).
Restrictions: This OPC block can be utilized with all Bailey interface types except
CIU01, serial port module (SPM, CPM02 & CPM03) and computer interface
command series (CIC). The other Bailey interfaces do not support being the
source of PID tuning parameters. Therefore, PID loop tuning of this point from
Bailey consoles is not possible.
TAGNAME TYPE ACCESS DESCRIPTION
ADDR_RING VT_I2 Config/Read Bailey CIU ring address.
ADDR_NODE VT_I2 Config/Read Bailey CIU node address.
ADDR_MODULE VT_I2 Config/Read Bailey CIU module address.
ADDR_BLOCK VT_I2 Config/Read Block number to establish this point at within
the Bailey interface (see note 1).
EU_CODE VT_I2 Config/Read Bailey engineering units code to use when
establishing this point (see note 2).
STN_TYPE VT_I2 Config/Read Bailey station type code to use when
establishing this point (see note 3).
ZERO VT_R4 Config/Read Zero of PV and SP values in engineering
units.
SPAN VT_R4 Config/Read Span of PV and SP values in engineering
units.
SIG_CHANGE VT_R4 Config/Read Amount that PV or SP must change, cycle to
cycle before it will be reported to Bailey.
Expressed as a percentage of the SPAN.
MAX_TIME VT_I4 Config/Read If PV, SP or OUT never changes significantly,
it will be reported at the maximum time
interval (seconds) defined by this attribute.
HI_LIM VT_R4 Config/
Read/Write
The setting for the process variable alarm limit
used to derive the high alarm condition (see
note 4).
LO_LIM VT_R4 Config/
Read/Write
The setting for the process variable alarm limit
used to derive the low alarm condition (see
note 4).
DV_LIM VT_R4 Config/
Read/Write
The setting for the deviation alarm limit
between the process variable and set point
used to derive the deviation alarm condition
(see note 4).
MESSAGE VT_BSTR Read Provides the block operational message.
TAG VT_BSTR Read Provides the block name.
TAGLONG VT_BSTR Read Provides the block long OPC path name.
TAGDESC VT_BSTR Read Provides the block descriptor.
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