Chapter 5 Relay Ladder Logic Programming 130
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20BDR (Data register)
The SG2 smart relay includes 240 DR coils that can be used throughout a program. The DR function plays a
important role in data-transmission. Its current value equals to preset value once it’s enabled. The data can be signed
or unsigned by O
peration>>module system set…menu selection from the SG2 Client software or keypad set. There
are 3 parameters for proper configuration. The table below describes each configuration parameter, and lists each
compatible element for configuring DR.
The parameter ① can be a constant or refer to the current value of other function.
The example below shows that the preset value refers to C01, when DR01 is conducted, the current value of
DR01 will be the current value of C01.
symbol Description
①
Current value
②
Preset value
Unsigned: 0~65535
Signed: -32768~32767
③
DR code (DR01~DRF0)
U: unsigned data
S: signed data
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