Flexi Link Stations: Teach Function - Mitsubishi Electric WS0-CPU0 Operating Manual

Figure 78:
Default values for Flexi Link
input bits
Note
ATTENTION
Flexi Link
Changing the default value of any bit changes the process image of the configuration
and in consequence the Flexi Link ID for the EFI string the changed bit belongs to.
You will be warned that you have to transfer the changed configuration to all stations
in order to apply the new Flexi Link ID. Otherwise the communication in the Flexi Link
network will be disrupted due to a Flexi Link ID mismatch (see also Section 7.2.2 and
Section 7.5).
7.4.6

Flexi Link stations: Teach function

The Teach function allows you to keep a Flexi Link system operable and running even
if one or more stations in the system are missing (i.e. switched off). "Teaching" the
missing station or stations will suspend them such that the other stations will simulate
their existence. Each suspended station will be treated as if it were online and running.
The Flexi Link process image will contain the values that have been configured as
default values for this station (see Section 7.4.5). This can be useful e.g. while setting
up a system or for maintenance purposes.
If the Teach function is active on any station and this station is connected to the
system and in the Run state, it will trigger the complete system to perform a network
scan and to treat all missing stations as suspended. I.e. the system will function as if
these stations were still online and use their default process images.
Before you use the Teach function, check whether a dangerous state can occur!
If the Teach function is used, the safety outputs on any of the still active stations may
be High.
 Analyze your application and check whether additional safety measures have to be
implemented if the Teach function is enabled.
 Consider how to handle the disconnected machine modules. Point out that the
control parts and sensors have no effect to the previously connected machine
modules (e.g. install "out of order" signs at E-stops).
 The teach function must be considered as a configuration process. Therefore the
teach function needs to be secured according to the respective safety requirements,
e.g. by using a key operated switch that is wired to the logic teach input and a
restart function block in the logic to check the timing condition.
 Only authorized and especially trained personnel are allowed to activate the Teach
function.
 Before using the Teach function, make sure that nobody is in the hazardous area or
has access to the hazardous area while the Teach function is active.
Chapter 7
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