990 HEIDENHAIN Technical Manual MANUALplus 620
External emergency
stop -ES.A and
-ES.B
For triggering an emergency stop, controls with HSCI have the emergency-
stop inputs –ES.A and –ES.B (e.g. –ES.A (X9/7a) and –ES.B (e.g. X9/7b) on the
PL). A "0" signal at –ES.A or –ES.B triggers an emergency stop reaction with
the error message external emergency stop. The familiar PLC inputs I3 and
I32 are being replaced by –ES.A and –ES.B in HSCI systems.
Both emergency stop inputs –ES.A and –ES.B must be wired. Both inputs
must carry the same signal. This signal is a safety-related signal and must be
generated by the appropriate devices (e.g. dual-channel emergency stop
button, safety contactor combinations).
If an external emergency stop is triggered,
the nominal speed value "null" is transmitted, braking the drives on the
intended braking ramp (usually at the limit of current)
the External emergency stop error message is displayed, and
the NN_GenNcEmergencyStop marker is set by the NC.
You can clear the error message with CE after switching the machine control
voltage back on.
However, an external emergency stop (–ES.A, –ES.B) does not disconnect the
output –-STO.A.G.
Axis enabling HEIDENHAIN recommends using the axis-specific "axis releases" of the CC via
the configuration in MP_driveOffGoupInput and MP_driveOffGroup in
addition to –ES.A and –ES.B, see page 218.
On controls with HSCI but without functional safety (FS), a pure axis enable,
which up to now has been realized over I32, can only be realized through the
function of the former X150. However, a CC 61xx and the UEC 11x do not not
have an X150 connector for axis-specific or axis-group-specific drive controller
enabling.
Instead, you can now enter in the MP_driveOffGroupInput machine
parameter (100106) eight numbers of those PLC inputs that simulate the
inputs of X150. If one of these PLC inputs is switched off, the corresponding
drives are decelerated on the provided braking ramp (usually at the limit of
current). Over PLC module 9161 you have to switch off the axes of the
affected axis groups. To do so, you can use PLC module 9157 to scan the
corresponding PLC inputs.
The axes are assigned to individual axis groups through the axis-specific
parameter MP_driveOffGroup (400015).
PLC operand / Description Ty p e
NN_GenNcEmergencyStop
Control in external emergency stop state
0: Control is not in external EMERGENCY STOP state
1: Control is in external EMERGENCY STOP state
M
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