Micromod MOD: MODBUS RTU Communications Guide - Manual (Page 20)

MODBUS RTU
COMUNICATIONS GUIDE
16
MODBUS WITH FIX AND COMMANDER 300
Either the MB1 or EMP driver may be used, though EMP is recommended. The MODBUS guide uses 3-digit
numbers for addresses. Note that the actual addressing requires a 5-digit number. For digital addresses, use
00xxx format, where xxx represents the coil address from the instruction book. For analog addresses, use
40xxx format, where xxx represents the register address from the instruction book.
Table 7. MODBUS with FIX and Commander 300
Poll Record Configuration
Hardware
MODBUS
Addressing Type 5-Digit
Bit Base 0-15
Data Type Unsigned - Positive Analog Ranges (0 to 4095)
Signed - Analog Ranges that go Negative (-2048 to +2047)
Database Configuration
Data Type Database Block Address Range Notes
Digital Input DI 00xxx
Digital Output DO 00xxx
Digital I/O DR 00xxx select output enable
Analog Input AI 40xxx 12BN (positive) or LZ12 (live zero)
Signal Conditioning
Analog Output AO 40xxx 12BN (positive) or LZ12 (live zero)
Signal Conditioning
Analog I/O AR 40xxx 12BN (positive) or LZ12 (live zero)
Signal Conditioning
NOTES:
1. Ensure that each line of the poll record contains no more than 8 analogs or 16 digital addresses.
2. It is acceptable to “read through” undefined addresses.