Standard data organization, Data types – Black Box GEH-6510 User Manual

Page 84

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DDE Server User’s Guide

Appendix A – Register Addressing Conventions

•••• 81

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

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