Mitsubishi Electric WS0-CPU0 Operating Manual page 145

Figure 118:
Hardware configuration view
of inputs and outputs linked
to Fast shut off
ATTENTION
Notes
Logic programming – Function blocks
At this point, the selected inputs and outputs are linked to each other such that the
output cannot be moved to another position and the inputs must stay on the WS0-
XTIO module in the hardware configuration. The elements which are linked are shown
in the hardware configuration in orange.
These links are broken when the Fast shut off function block is edited or deleted.
Fast shut off with bypass
In some applications it may be necessary to bypass the Fast shut off. This could be,
e.g. in a safe machine setup mode, in which the machine can be operated only in jog
mode. To this purpose, the Fast shut off with bypass function block is available. It is
used and configured in the same way as the Fast shut off function block. The only
difference is that one of the inputs of the Fast shut off with bypass function block is
used for the Bypass function. If the Bypass input is High, the Fast shut off with bypass
function block is bypassed.
Ensure the system or machine is in a safe condition when using the bypass
function!
As long as the bypass function is active, any stopping condition, e.g. the infringement
of a protective field will not lead to a shut-off of the machine. You must ensure that
other protective measures are forcibly activated during the bypass, e.g. the safe
machine setup mode, so that the machine cannot endanger persons or parts of the
system during the bypass function.
Take the prolonged response time into account when the Bypass is
deactivated!
If the Bypass input is being deactivated while a switching-off condition exists, the
outputs will switch off only with the normal response time of the application. The
minimized response time for Fast shut off does not apply for the Bypass input.
Consider this for your risk analysis and avoidance strategy. Otherwise the operator of
the machine will be in danger.
 Unlike the other inputs and outputs of this function block, the Bypass input can be
connected to an output of another function block as well as to any other input
element which may also be moved to another module in the hardware configuration.
Chapter 9
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