error 2 for modbus_read_input_bits & modbus_read_input_registers
46 views
Skip to first unread message
giorgio foga
Mar 7, 2016, 12:07:13 PM3/7/16
to libmodbus
In fatek plc RS485 obtain error cod. 2 on request modbus_read_input_bits or modbus_read_input_registers .... other reading operation are performed ok (coils and holding)...... modbus_read_input_registers in fatek plc not existing so the error is normal but reading from register 1001 return these strange error MODBUS_EXCEPTION_ILLEGAL_DATA_ADDRESS (2).
Sorry .... I'm on ubuntu 14.04 kernel 3.19 lowlatency ... libmodbus from repo.
Other similar issue ??
regards
Giorgio
Sorry .... I'm on ubuntu 14.04 kernel 3.19 lowlatency ... libmodbus from repo.
Other similar issue ??
regards
Giorgio
giorgio foga
Mar 7, 2016, 12:09:44 PM3/7/16
to libmodbus
Il giorno lunedì 7 marzo 2016 18:07:13 UTC+1, giorgio foga ha scritto:
In fatek plc RS485 obtain error cod. 2 on request modbus_read_input_bits or modbus_read_input_registers .... other reading operation are performed ok (coils and holding)...... modbus_read_input_registers in fatek plc not existing so the error is normal but reading from register 1001 return these strange error MODBUS_EXCEPTION_ILLEGAL_DATA_ADDRESS (2).
Sorry .... I'm on ubuntu 14.04 kernel 3.19 lowlatency 64bit ... libmodbus from repo.
giorgio foga
Mar 8, 2016, 5:37:34 AM3/8/16
to libmodbus
ok FATEK support inform me about that:
B1 plc isn't able to read multiple input_bit with 0x02 command .....is possible only with 1 command and only for one input at time.
SOLVED.
B1 plc isn't able to read multiple input_bit with 0x02 command .....is possible only with 1 command and only for one input at time.
SOLVED.
Reply all
Reply to author
Forward
0 new messages