Automation Direct D2–DCM User Manual page 65

C–8
Using the D2–DCM with MODBUS
Data Communications Module, 2nd Edition, 2/03
Registers
V Memory (Timers)
V Memory (Counters)
V Memory (Data Words)
* MODBUS: Function 04 (New Feature)
The DL–250, DL–350 and DL450 will support function 04 read input register (Address
30001). To use function 04, put the number '4' into the most significant position (4xxx). Four
digits must be entered for the instruction to work properly with this mode.
LD
K101
LD
K4128
LDA
O4000
RX
Y0
1. Refer to your PLC user manual for the correct memory mapping size of your PLC. Some of
the addresses shown above might not pertain to your particular CPU.
2. For an automated MODBUS/Koyo address conversion utility, download the file
modbus_conversion.xls from the www.automationdirect.com website.
Word Data Types
PLC Range Input/Holding
(Octal) (484 Mode)*
V0 – V377 3001/4001
V1000 – V1177 3513/4513
V1200 – V1377 3641/4641
V1400 – V1746 3769/4769
V1747 – V1777
V2000 – V7377
V10000 – V17777
The Maximum constant possible is 4128. This
is due to the 128 maximum number of Bytes
that the RX/WX instruction can allow. The
value of 4 in the most significant position of the
word will cause the RX to use function 04
(30001 range).
Input/Holding
(584/984 Mode)*
30001/40001
30513/40513
30641/40641
30769/40769
––– 31000/41000
––– 41025
––– 44097