Micromod MOD: MODBUS RTU Communications Guide Manual de usuario descargar pdf (Pagina 20)

MODBUS RTU

COMUNICATIONS GUIDE

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.

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Micromod MOD: MODBUS RTU Communications Guide Manual de usuario Pagina 20