Mitsubishi Electric WS0-CPU0 Operating Manual page 106

Chapter 7
Note
Figure 79:
Configuration of the Teach
function in the logic editor
ATTENTION
103
Flexi Link
 A station is considered as "missing" and can be suspended if its power supply is
switched off or if its EFI connection to the Flexi Link system has been interrupted
completely. It is not possible to suspend a station if it is still connected and e.g. one
of the following conditions applies:
– The station is not in the Run state.
– The station has generated an EFI error, e.g. due to a Flexi Link ID mismatch.
 Teaching always affects all powered stations in the Flexi Link system, not a single
station. Therefore it may be sufficient to activate the Teach function just on one of
the connected stations. However, if only one station in the system is equipped with
a teach button and configured for teaching, then only the other stations in the
system can be suspended since this particular station is needed for activating the
Teach function.
 Each CPU in a Flexi Link system signals the current system status via status bits
that can be used as inputs in the logic editor (see Section 7.4.7).
How to configure the Teach function:
 Connect a Teach button to the inputs of each station in the Flexi Link system that
shall be able to activate the Teach function. The Teach button can be e.g. a dual
channel key operated switch.
 In the logic editor for these stations, use a Restart function block to connect the
Teach button input to this station's Teaching output as shown in Figure 79.
If the Teach button is pressed, the Teaching output will become High for one logic cycle.
The rising edge (Low to High) on the Teaching output triggers the Teach function.
Ensure that the transitions of the signals for Teaching fulfill the requirements!
In case of a short-circuit to High (to 24 V DC) at a physical input, the evaluated signal
can have a pulse when the signal is reset due to the short-circuit detection. If such a
pulse can result in a dangerous state in the machine, the following points have to be
observed:
 Ensure protected cable laying for the signal line (due to cross-circuiting to other
signal lines).
 No short-circuit detection, i.e. do not reference to test outputs.
How to use the Teach function:
 In a running Flexi Link system, switch off the power supply of one or more
stations (e.g. Station C). The system will detect that these stations are missing
and set their process image to failsafe values (zeros). The remaining stations will
show an EFI error (EFI LEDs flashing
switched off station(s) (e.g. Station C missing) will become High and Station
missing will become High as well.
red) and their EFI status bits for the