M
ODBUS
TCP C
ONFIGURATION
SMD23E2 and SMD24E2 User’s Manual
ADVANCED MICRO CONTROLS INC.
120
6.3 AMCI Modbus TCP Memory Layout
The SMD23E2 and SMD24E2 has a starting Input Register address of 0 and a starting Output Register
address of 1024. Input Registers hold the data from the driver while Output Registers hold the data to be writ-
ten to the unit. Figure T6.1 shows how an SMD23E2 or SMD24E2 is mapped to the Modbus data reference.
The complete specification for the Modbus protocol can be downloaded at http://www.modbus.org/specs.php.
Figure T6.1 Modbus Data Reference Map
6.4 Supported Number of Connections
All SMD23E2 and SMD24E2 units support six concurrent connections. When connections exist, the Network
Status (NS) LED on the back of the unit will flash green. The number of blinks indicate the number of active
connections. There is a two second break between groups of flashes.
Network Input
Data
Not Implemented
Network Output
Data
LSB and MSB
Numbers
Mapped as:
Discrete Inputs
Holding Registers
Input Registers
Mapped as:
Coils
Holding Registers
Register 1024
Register 1033
16,384
16,399
16,528
16,543
Register 9
144
159
0
15
Register 0
