DL205 User Manual, 4th Edition, Rev. B
5–209
Chapter 5: Standard RLL Instructions - Modbus
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• Exception Response Buffer: specifies the master memory address where the Exception Response
will be placed (6-bytes in length). See the table on the following page.The exception response buffer
uses 3 words. These bytes are swapped in the MRX/MWX exception response buffer V-memory so:
V-Memory 1 Hi Byte = Function Code Byte (Most Significant Bit Set)
V-Memory 1 Lo Byte = Address Byte
V-Memory 2 Hi Byte = One of the CRC Bytes
V-Memory 2 Lo Byte = Exception Code
V-Memory 3 Hi Byte = 0
V-Memory 3 Lo Byte = Other CRC Byte
MWX Slave Memory Address
MWX Master Memory Addresses
MWX Slave Address Ranges
Function Code Modbus Data Format Slave Address Range(s)
05 - Force Sinlge Coil 484 Mode 1-999
05 - Force Single Coil 584/984 Mode 1-65535
06 - Preset Single Register 484 Mode 4001-4999
06 - Preset Single Register 584/984 Mode
40001-49999 (5 digit) or
400001-465535 (6 digit)
15 - Force Multiple Coils 484 Mode 1-999
15 - Force Multiple Coils 584/984 Mode 1-65535
16 - Preset Multiple Registers 484 Mode 4001-4999
16 - Preset Multiple Registers 584/984 Mode
40001-49999 (5 digit) or
4000001-465535 (6 digit)
MWX Master Memory Address Ranges
Operand Data Type DL260 Range
Inputs X 0-1777
Outputs Y 0-1777
Control Relays C 0-3777
Stage Bits S 0-1777
Timer Bits T 0-377
Counter Bits CT 0-377
Special Relays SP 0-777
V-memory V all (see page 3-56)
Global Inputs GX 0-3777
Global Outputs GY 0-3777
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