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Yokogawa DX Serial Driver
Address Type
Format
Range
Data Type
Access
Status of Channel*
CHxx.status
01-04
String
Read Only
Lowest Measuring Channel*
CH.Low
Short
, Word, Byte
Read Only
Highest Measuring Channel*
CH.High
Short
, Word, Byte
Read Only
Math Channels
Address Type
Format
Range
Data Type
Access
Process Value of Math Channel
CHxx or CHxx.PV
31-38
Double
, Float
Read Only
Alarm Summary of Math Channel
CHxx.Alarm
31-38
Short
, Word, Byte
Read Only
Alarm Level1 Status of Math Channel
CHxx.Alarm1
31-38
Short
, Word, Byte
Read Only
Alarm Level2 Status of Math Channel
CHxx.Alarm2
31-38
Short
, Word, Byte
Read Only
Alarm Level3 Status of Math Channel
CHxx.Alarm3
31-38
Short
, Word, Byte
Read Only
Alarm Level4 Status of Math Channel
CHxx.Alarm4
31-38
Short
, Word, Byte
Read Only
Set and Read Level1 Alarm Setpoint
CHxx.ASP1
31-38
Double
, Float
Read/Write
Set and Read Level2 Alarm Setpoint
CHxx.ASP2
31-38
Double
, Float
Read/Write
Set and Read Level3 Alarm Setpoint
CHxx.ASP3
31-38
Double
, Float
Read/Write
Set and Read Level4 Alarm Setpoint
CHxx.ASP4
31-38
Double
, Float
Read/Write
Upper Scale Value of Math Channel*
CHxx.scale_Hi
31-38
Double
, Float
Read Only
Lower Scale Value of Math Channel*
CHxx.scale_Lo
31-38
Double
, Float
Read Only
Unit String of Math Channel*
CHxx.unit
01-38
String
Read Only
Tagname of Math Channel*
CHxx.tag
01-38
String
Read Only
Status of Math Channel*
CHxx.status
01-38
String
Read Only
Lowest Math Channel*
CHA.Low
Short,
Word, Byte
Read Only
Highest Math Channel*
CHA.High
Short
, Word, Byte
Read Only
*Data associated with these addresses are only read from the device at the start of a communications
session. Once read, the values will not be refreshed until the server has been restarted or the "Reset" tag
has been invoked. To invoke a reset, a non-zero value must be written to the Reset tag. Once the Reset tag
has been invoked the driver will reinitialize all startup data from the device.
Alarm Setpoints
Data values for Alarm Setpoints that are undefined in the device will be returned as +INF. Data values can
only be written to Alarm Setpoints that are defined in the device. Write operations to undefined Alarm
Setpoints will return an error. Write operations are available only for users logged in at the Administrator
level and will return an error otherwise. Alarm setpoint values are read one channel at a time. For devices
with a large number of channels, increasing the scan rate of ASP items and/or reducing the number of active
ASP items will increase the read performance of the PV and alarm data.
Scales
Data values for Scale_Hi and Scale_Lo for channels that are skipped will be returned as +INF.
Tag Names
For devices that do not support tag names and channels that have unspecified tag names, the driver will
construct an internal tag name based on the channel number. For example, the tag name of address 'CH01'
will be returned as 'CH01'.
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