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3.2 OPC Interface Functions
3.2.3 ItemID
An arbitrary string used to identify items. It is generally called tags.
Defining the ItemID
DAQOPC defines ItemIDs as follows:
Device!tag number.data item
Example: DEVICE1!CH001.PV
The “DEVICE” section is fixed. In the number section that follows, specify the
device position that you assigned using the Configurator.
A list of ItemIDs
On DAQOPC, the following items can be accessed using ItemIDs.
ItemID
Description
Canonical Access
data type Rights
DEVICExx!CHxxx.PV
Measured value or computed result
VT_R8
Read Only Measurement and
computation channels only
DEVICExx!CHxxx.ALARMx
Alarm status of the specified
channel
VT_I2
Read Only Measurement and
computation channels only
DEVICExx!CHxxx.ATx
Alarm type of the specified channel
VT_I2
Read Only Measurement and
computation channels only
DEVICExx!CHxxx.ASPx
VT_R8
DEVICExx!Loopx.PV
Alarm setpoint of the specified
channel
PV of the specified loop
Read/Write2 Measurement and
computation channels only
Read Only
CX control loops only
DEVICExx!Loopx.SP
SP of the specified loop
VT_R8
Read Only
CX control loops only
DEVICExx!Loopx.OUT
OUT of the specified loop
VT_R8
Read/Write2
CX control loops only
DEVICExx!Loopx.ALARMx
Alarm status of the specified loop
VT_I2
Read Only
CX control loops only
DEVICExx!Loopx.ATx
Alarm type of the specified loop
VT_I2
Read Only
CX control loops only
DEVICExx!Loopx.RUN1
Run/Stop switching of the specified
loop
VT_I2
Read/Write2
CX control loops only
DEVICExx!Loopx.MODE1
Control mode switching of
the specified loop
VT_I2
Read/Write2
CX control loops only
DEVICExx!Loopx.REMLOC1
Remote/Local switching of
the specified loop
VT_I2
Read/Write2
CX control loops only
DEVICExx!Loopx.SPNO1
Current SP number of the specified
loop and switching of the number
VT_I2
Read/Write2
CX control loops only
DEVICExx!Loopx.PIDNO1
Current PID number of the specified
loop
VT_I2
Read Only
CX control loops only
DEVICExx!Loopx.PID-SP
SP of the specified PID of
the specified loop
VT_R8
Read/Write2
CX control loops only
DEVICExx!Loopx.PID-ASPx
Alarm setpoint of the specified PID
of the specified loop
VT_R8
Read/Write2
CX control loops only
DEVICExx!Loopx.PID-P
Proportional band of the specified
PID of the specified loop
VT_R8
Read/Write2
CX control loops only
DEVICExx!Loopx.PID-I
Integral time of the specified PID
of the specified loop
VT_I2
Read/Write2
CX control loops only
DEVICExx!Loopx.PID-D
Derivative time of the specified PID
of the specified loop
VT_I2
Read/Write2
CX control loops only
DEVICExx!Loopx.PID-OH
Output high-limit of the specified
PID of the specified loop
VT_R8
Read/Write2
CX control loops only
DEVICExx!Loopx.PID-OL
Output low-limit of the specified PID
of the specified loop
VT_R8
Read/Write2
CX control loops only
1,2
3-10
VT_R8
Notes
With the Advanced version, data can only be written to the DX/MV/CX if a user with Administrator privilages is logged
on. Data cannot be written to the DX/MV/CX with the Basic version.
IM 04L01B03-61E