Mounting of the Safety System
20
TMC 66
Leuze electronic
DEUTSCH
E
NGLISH
FRANÇAIS
IT
A
LIANO
ESPAÑOL
N
EDERLANDS
The diagram illustrates the signal flows during the muting cycle.
First, the two control signals on the TMC 66 are activated by the control unit. Note that the
control signals must originate from different signal sources. In the example above, the
Control 1 signal comes from the PLC, the Control 2 signal has to be deduced from the
pallet transport (contactor or NC drive).
For the function of the TMC 66, the connection order of the control signals is without
meaning. The time period between connection of the first and second control signal can be
between 0 ms and an infinitely long time period. Only after both signals have been
activated, the internal test of the TMC 66 starts. The control signals have to be permanently
active during the whole muting procedure.
The internal circuit and the connected muting light signals are tested during a time period of
5 ms.
After a successful internal test, the connected muting sensors are tested. The TMC 66
takes over the control function. The TMC 66 "expects" a reaction on the issued signal
changes from the signals of "Start 1" and "Start 2".
At every change of a pulse edge the sensors have to respond within 240 ms. After
successful test completion of "Start 1" and "Start 2", the muting function is prepared - the
TMC 66 hands over the controlling function to the sensors.
As soon as the first muting sensor is darkened, that means signal "Start 1" switches off,
the single beam safety light barrier output signal is suppressed (muted). After a minimum
time period of 5 ms, the second photo electric muting sensor can be interrupted, that
means "Start 2" can be switched off. A maximum time period for this signal change is not
Fig. 4.2-6:
Signal flows during muting
Test Start 1 and Start2
internal test
app.
5 ms
Muting
test
TMC
internal
Time dep. on resp. time of the
muting sensors, max. 960 ms
selectable time
period min. 5 ms
selectable time
period
End of muting
Muting test
of the sensors
Muting
prepared
Muting
active
Muting
off
selectable time pe-
riod min. 10 ms
Muting
prepa-
ration
Motor
contactor
* maximum response time 240 ms