6.4 Negative Acknowledgement
• When non-existent data item is read or written:
For MEWTOCOL, if the data item is read, acknowledgement (data is 0) will be returned.
If the data item is written, the data will be discarded, and acknowledgement will be returned.
(If Data larger than DT 10000 is read or written, Error code 61H will be returned.)
For Modbus, Exception code 2 (02H) will be returned.
• When a value out of the setting range is written:
The slave will return Error code 61H (MEWTOCOL) or Exception code 3 (03H, Modbus).
The slave will return Error code 63H (MEWTOCOL) or Exception code 17 (11H, Modbus) in the following
cases:
• When AT/Auto-reset Perform or AT on startup Perform is written during PI control or ON/OFF control action
• While AT is performing in Fixed value control, if any item – except AT/AT on startup/Auto-reset Cancel,
Control output OFF function, Direct/Reverse action – is written
(If AT/AT on startup/Auto-reset Cancel, Control output OFF function, or Direct/Reverse action is written, AT
will stop.)
• While AT is performing in Program control, if any item – except AT/AT on startup/Auto-reset Cancel,
Program control STOP, Direct/Reverse action, Program control Advance Perform, Program control
Holding/Not holding, Key operation change flag clearing – is written
(If AT/AT on startup/Auto-reset Cancel, Program control STOP, Direct/Reverse action, Program control
Advance Perform, or Key operation change flag clearing is written, AT will stop.
If Program control Holding/Not holding is written, AT will continue.)
• When Manual control MV is written during automatic control
• When the OUT/OFF key function is written while in Control output OFF status
• When the OUT/OFF key function is written during manual control
• When the OUT/OFF key function is written while program control is performing
The slave will return Error code 63H (MEWTOCOL) or Exception code 18 (12H, Modbus) in the following case.
• During setting mode by keypad operation, if any item – except Control output OFF function, Program control
RUN/STOP, Program control Advance Perform, Program control Holding/Not holding, Key operation change
flag clearing – is written
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