Chapter 9
151
Logic programming – Function blocks
9.7.16 Log generator
Function block diagram
General description
The Log generator function block monitors up to eight inputs. If at one of these inputs
an edge is detected according to the configuration, the function block sets the
corresponding output to High for the duration of the logic execution time and adds a
user defined text message to the diagnostics history. This can be read out in online
mode using the Setting and Monitoring Tool diagnostic function (see Section 5.8).
These messages will be deleted when the voltage supply for the MELSEC-WS safety
controller is interrupted.
Parameters of the function block
Parameter Possible values
Number of inputs 1 to 8
Messages Up to 64 user defined messages per project.
Message assignment
Rising edge
Falling edge
Rising
or falling edge
How to configure the Log generator function block:
The following example shows the Log generator function block with two emergency
stop buttons and a safety switch attached.
Figure 125:
Function block diagram for
the Log generator function
block
Note
Table 60:
Parameters of the Log
generator function block
Figure 126:
Configuration example for
Log generator with two
emergency stop buttons and
a safety switch
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