276 HEIDENHAIN Technical Manual MANUALplus 620
X30: Handwheel
connection,
permissive button /
emergency stop
With the MB 620T without FS, the permissive buttons and the EMERGENCY
STOP of the handwheel must be wired externally in corresponding safety cir-
cuits as before.
Pin layout of MB 620T FS:
The emergency stop inputs (pin 6 and pin 8) are active even if the HR hand-
wheel has been deactivated via machine parameter MP_type (100601). It is
therefore always necessary to wire the Emergency Stop inputs correctly.
Emergency stop buttons are to be used only for emergency stop purposes.
Under normal operating conditions, a machine must not be switched off via
the emergency stop buttons. The proper functioning of all emergency stop
buttons must be tested annually by pressing these buttons.
Connection X30 not used on MB 620T without FS.
Connecting
terminals
Assignment
1 Permissive button channel A / terminal 1 (+24 V NC)
2 Permissive button channel A / terminal 2
3 Permissive button channel B / terminal 1 (+24 V NC)
4 Permissive button channel B / terminal 2
5 Emergency stop channel A / supply for channel A (–TEST.A)
6 Emergency stop channel A / terminal 2
7 Emergency stop channel B / supply for channel B (–TEST.B)
8 Emergency stop channel B / terminal 2
Please note that the MB 620T is powered by +24 V NC.
For the entire HSCI system, the +24 V NC supply voltage is required to be
safely separated voltage. The +24 V NC supply voltage must not, under any
circumstances, be connected with the +24 V PLC supply voltage, because
this removes the double basic insulation.
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