Automation Direct D2-DCM, Руководство пользователя

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C–8
Using the D2–DCM with MODBUS
Data Communications Module, 2nd Edition, 2/03
Word Data Types
Registers PLC Range
(Octal)
Input/Holding
(484 Mode)*
Input/Holding
(584/984 Mode)*
V Memory (Timers) V0 – V377 3001/4001 30001/40001
V Memory (Counters) V1000 – V1177 3513/4513 30513/40513
V Memory (Data Words) V1200 – V1377 3641/4641 30641/40641
V1400 – V1746 3769/4769 30769/40769
V1747 – V1777 ––– 31000/41000
V2000 – V7377 ––– 41025
V10000 – V17777 ––– 44097
* 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.
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).
LDA
O4000
LD
K4128
LD
K101
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.