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47DAC OPERATING MANUAL EM-9518-B Rev.4
23. SETTING MODBUS COMMUNICATION
Data readout and parameter configuration of the 47DAC with a PLC or a PC are available via Modbus communication.
This manual describes setting procedures of the device address, baud rate, parity bit, stop bit, long register and timers.
Refer to Modbus Protocol Reference Guide for 47Dx for the protocols and commands.
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PARAMETERS
PARAMETER
MAIN DISPLAY
FUNCTION
DEFAULT VALUE
Device address
to
Device address
BAUD RATE
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
38400 bps
Parity bit
Odd
Even
None
Stop bit
1 bit
2 bits
T1.5 timer
to
Protocol operating timer, T1.5
T3.5 timer
to
Protocol operating timer, T3.5
Long register
Low-digit word at lower address
High-digit word at lower address
IMPORTANT
• Modbus setting changes are enabled only after the power supply has been turned off and on.
• The T1.5 and T3.5 timers are specified as 1.5 and 3.5 characters times in Modbus standard specifications. These pa-
rameters are not necessary to be changed normally.
• It is also possible to change the settings via Modbus communication.
• A communication error occurs in moving on to each Setting Mode with the front button control during the Modbus com-
munication.
NOTE
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CAUTIONS IN MODBUS COMMUNICATION
• The alarm indicators after a one-shot output provided, set in Alarm Setting Mode, are the same as those at the normal
contact output.
• Even when the coil at alarm is changed in Alarm Setting Mode, operation of the alarm indicators is not reversed.
• The operation of the alarm indicators are not changed even when the P output is set in Advanced Setting Mode.
• The reference values in executing the Forced Zero and Tare Adjustment can be set to the ones other than ‘0’.
• The MAX and MIN values can be set in their addresses even while ‘S.ERR’ is indicated.
