Standard data organization, Data types – Black Box GEH-6510 User Manual
Page 84
DDE Server User’s Guide
Appendix A – Register Addressing Conventions
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t represents the type of data, if there are any
special conventions. See the following section
“Special Naming Conventions” for details.
A indicates that the data is an Array.
See the following section “Register
Array Format” for details.
-b represents the reading of
individual bits. Not present if
reading whole registers or an
array of registers. See the
following section “Individual
Bits in Registers” for details.
lll provides the length of the array
or ASCII string in bytes, This field
is present only if the address
represents an array or an ASCII
string. Leading zeros are not
required for this field.
R <f> <[X]nnnn> [t] [A] [lll] [-b]
Standard Data Organization
Data is organized according to data type, numeric range, tag type, and access type.
Data Types
There are four data types typically used by the GE devices. These four data types are
the possible values for ‘f’ in the address. (Each data type is organized in a separate
table for each device in this manual):
1. Dynamic Value
2. Setpoint
3. Command Coil
4. Fixed Value
Each data type is assigned a range of register numbers, tag type, and access as shown
below:
Data Organization
Data
Type
Use
Register
Range
(hex)
Register
Range
(decimal)
DDE
Tag
Type
Type of
Access
Command
Coil
1. Commands a device to take
action.
2. Reads the status of an
action or discrete input.
R0X0000 –
R0XFFFF
R00000 –
R09999
Discrete
Read and
Write
Dynamic
Value
Read frequently, such as
metering values which change
constantly
R3X0000 –
R3XFFFF
R30000 –
R39999
Analog
Read Only
Fixed
Value
Read only once at power-up.
Info such as Product ID and
configuration options
R4X0000 –
R4XFFFF
R40000 –
R49999
Analog
Read Only
Setpoint
Read infrequently
R4X0000 –
R4XFFFF
R40000 –
R49999
Analog
Read Only