17 – 240 HEIDENHAIN Service Manual iTNC 530 HSCI
17.3 EMERGENCY STOP test during switch-on
In the event of hazardous errors the control switches off the Control-is-ready output.
An EMERGENCY STOP must be generated. --> The EMERGENCY STOP chain must be interrupted.
Since this is a function important for the safety on the machine, it is checked via the EMERGENCY
STOP test every time the line power is switched on.
One of the requirements of EN ISO 13849-1 is that the power-up test (EMERGENCY STOP test and
braking test) must be repeated within no more than 168 hours.
Figure: Detail of the basic circuit diagram with PL 62xx
The emergency stop test was expanded for HSCI controls without functional safety (FS).
After the emergency stop test or a self-test is started, internal signals of the HSCI participants are now
tested for proper function in a first phase. In a further, second phase the emergency stop test and
brake test are conducted with external signals (ES.A, ES.B, STO.A.G).
But it still applies that, in the event of an error, a drop-off of the control-is-ready output (MC.RDY or
STO.A.G) always triggers an emergency stop.
The Control-is-ready signal acknowledgment has to occur within 1 s.
Integration of iTNC 530 HSCI
into EMERGENCY STOP chain
PLB 62xx UEC 11x Signal
Supply of control-is-ready output X9, terminal 1a X4, terminal 1a - - -
Control-is-ready output X9, terminal 3a X6, terminal 12a MC.RDY or STO.A.G
(Safe Torque Off)
Input for control-is-ready
acknowledgement
X9, terminal 7a X5, terminal 9a ES.A (emergency stop A)
X9, terminal 7b X5, terminal 10a ES.B (emergency stop B)
Either the control-is-ready output and input on the PLB 62xx system module or on the UEC 11x
compact controller unit are used.
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