Automationdirect.com DirectLOGIC DL205 Series User Manual page 423

Chapter 5: Standard RLL Instructions - Modbus
• 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
1
uses 3 words. These bytes are swapped in the MRX/MWX exception response buffer V-memory so:
2
3
4
MRX Slave Memory Address
5
6
Function Code
01-Read Coil
01-Read Coil
7
02-Read Input Status
02-Read Input Status
8
03-Read Holding Register
03-Read Holding Register
9
04-Read Input Register
04-Read Input Register
10
07-Read ExceptionStatus
11
MRX Master Memory Addresses
12
13
14
A
B
C
D
5–206
DL205 User Manual, 4th Edition, Rev. B
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
MRX Slave Address Ranges
Modbus Data Format
484 Mode
584/984 Mode
484 Mode
584/984 Mode
484 Mode
584/984
484 Mode
584/984 Mode
484 and 584/984 Mode
MRX Master Memory Address Ranges
Operand Data Type
Inputs
Outputs
Control Relays
Stage Bits
Timer Bits
Counter Bits
Special Relays
V-memory
Global Inputs
Global Outputs
Slave Address Range(s)
1-999
1-65535
1001-1999
10001-19999 (5 digit) or 100001-
165535 (6 digit)
4001-4999
40001-49999 9 (5 digit) or
4000001-465535 (6 digit)
3001-3999
30001-39999 (5 digit) or 3000001-
365535 (6 digit)
n/a
DL260 Range
X 0-1777
Y 0-1777
C 0-3777
S 0-1777
T 0-377
CT 0-377
SP 0-777
V all (see page 3-56)
GX 0-3777
GY 0-3777