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Alternate MODBUS Ladder Programming
The Read and Write commands for the DL260 and DL06 CPUs are different from
other
Direct LOGIC CPUs. Rungs 5 and 6 are shown below as they relate to
DL260 and DL06 CPUs.
Rung 5 writes the values from V2000 to V2023 to the drive parameters 9.11 to 9.30.
In the MWX box, the Start Slave Memory Address value is 42316. 42316 is a
MODBUS decimal number. To convert 42316 decimal to hex, you first subtract 40001,
and then convert the remainder to hex (90B). 90B is the address for parameter 9.11.
Note: Refer to your PLC User Manual for more specifics on MODBUS addressing and
address conversions.
If you only want to control the start/stop and speed reference of the drive, simply change
the number of elements to K2 and the slave memory address to 42331. Then V2000
would be your speed reference location and V2001 would be your start/stop location.
Rung 6 is used to read the status of the GS1 AC drive. These instructions read the
values from the GS1 status addresses, 2100 to 2105, and places the values into
the PLC memory addresses, V3000 to V3005.
The Start Slave Memory Address in the MRX box is 48449. 48449 is a MODBUS
decimal number. To convert 48449 decimal to hex, you first subtract 40001, and then
convert the remainder to hex (2100). 2100 is the address for the GS1 Status Monitor.
Chapter 5: GS1 MODBUS Communications
GS1 Series AC Drive User Manual
5–12
SP116 C100
( )
SET
C100
5
MWX
Port Number:
Slave Address:
Function Code:
Start Slave Memory Address:
Start Master Memory Address:
Number of Elements:
Modbus Data type:
Exception Response Buffer: K2
K1
16 - Preset Multiple Registers
42316
V2000
K20
584/984 Mode
V5000
SP116 C100
( )
RST
C100
6
MRX
Port Number:
Slave Address:
Function Code:
Start Slave Memory Address:
Start Master Memory Address:
Number of Elements:
Modbus Data type:
Exception Response Buffer: K2
K1
03 - Read Holding Registers
48449
V3000
K6
584/984 Mode
V5005
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