December 2001 Monitoring Functions 6 – 173
6.11.12 EMERGENCY STOP Monitoring
On the control there are the PLC input I3 (X42/4) and a PLC output (X41/34)
with the designation control-is-ready for the EMERGENCY STOP routine.
If a functional error is detected, the TNC switches the control-is-ready output
off. A blinking error messages appears and the PLC program is stopped. You
cannot clear this error message with CE:
7
77
7 Correct the error and restart the switch-on routine.
If the “control-is-ready signal acknowledgement” input is switched off by a
process external to the control, the error message EXTERNAL EMERGENCY STOP
appears. The NC sets M4177 and M4178. The nominal speed value 0 is output
and the drives are switched off. You can clear this error message after
switching the machine control voltage back on.
7
77
7 In MP1152, define the interrogation of the “control-is-ready signal
acknowledgement” input. If MP1152 = 0, the input is interrogated directly
by the NC (in the position controller cycle). If MP1152 = 1, the input is
processed by the PLC (in the PLC cycle) before being passed on to the NC.
Resetting the “control-is-ready signal acknowledgement” inputs leads to
position monitoring being shut off for the time defined in MP1150.1, and to an
actual-to-nominal value transfer. After the time defined in MP1150.1 has
expired, position monitoring is again active, for at least the time defined in
MP1150.2.
If marker M4580 is set, then instead of the external emergency stop
(“control-is-ready signal acknowledgement” input), the control loops of all
axes and of the spindle are opened, and an NC stop is performed.
MP1152 Interrogation of I3 “Control-is-ready signal
acknowledgement”
Input: 0: I3 is passed on directly to the NC
1: I3 is processed by the PLC before being passed on to the NC
Warning
MP1150.1 = 0 switches position monitoring off! Safe machine operation is
not possible if the position monitoring function is switched off.
Uncontrolled machine movements will not be detected!
Set Reset
M4177 Erasable error message is displayed NC NC
M4178 Error message EMERGENCY STOP is
displayed
NC NC
M4580 Suppress EMERGENCY STOP, open
all position control loops, NC stop
PLC PLC
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