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Mitsubishi Electric MELDAS C6 Interface Manual Page 202

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B con-
Signal name
tact
PLC EMERGENCY STOP
[Function]
The controller can be set to emergency stop condition, like the case where emergency stop signal
is given by user PLC.
[Operation]
Emergency stop occurs in the controller when the signal (QEMG) is turned ON. In this case, "Servo
ready (SA)", etc. are turned OFF.
(Note) Since this signal is processed in software, response is somewhat slower, as compared with
external emergency stop signal. Approximate response is equal to 1 scan by user PLC plus
100msec.
B con-
Signal name
tact
DOOR OPEN
[Function]
This signal stops all axes, and cuts off contactor power.
[Operation]
The NC carries out the following operations when the "Door open" signal turns ON.
(1) A deceleration stop is carried out for all axes (servo axes and spindles).
(2) A ready OFF state occurs after all axes stop, and the contactor power of each amplifier is cut
off.
(3) The "Door open enable" signal turns ON.
The NC carries out the following operations when the "Door open" signal turns OFF.
(1) A ready ON and servo ON state occurs for all axes.
(2) The "Door open enable" signal turns OFF.
[Caution]
(1) Handling of the PLC axis
Set so a "Door open" signal is output to the NC after the PLC axis is stopped by the PLC.
If a "Door open" signal is input without stopping the PLC axis, the axis will stop with a dynamic
brake method due to the ready OFF state.
The remaining distance will be held in the R register being used in the DDB.
(2) Handling of the analog spindle
When an analog spindle is connected, it is not possible to confirm that the spindle has
completely stopped with the NC. Thus, confirm that the spindle has completely stopped using
the PLC, before opening the door.
Because the spindle may start rotating again immediately after the door is closed, for safety turn
the forward run and reverse run signals OFF when the door is open.
(3) Opening the door during ATC operation
When opening the door during ATC operation, apply an interlock with the user PLC.
[Related signals]
Door open enable signal (X429)
6. EXPLANATION OF INTERFACE SIGNALS
6.3 PLC Output Signals (Bit Type: Y***)
Signal
abbreviation
QEMG
Signal
abbreviation
DOOR1
6-3-5
1st system
2nd system
Y427
1st system
2nd system
Y428
3rd system
3rd system

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