The value set in this function block determines the minimum duration of the muting
function. If the muting function ends before this time has elapsed, an error is output.
Configuration instructions:
The configuration of the minimum time in this network is based on the counting of peri‐
ods at a defined clock with a defined overflow value.
The defined clock periods are set in the
Time monitoring general
network,
tion of Time monitoring", page 31
.
The overflow values for the various timings must be set in the
Event Counter (up)
function
blocks in this network. If the Timing Set Selection function is not used, only the upper‐
most
Event Counter (up)
function block has to be configured. The time required until the
overflow value for the respective
Event Counter (up)
function block is reached with the pre‐
set clock determines the minimum duration of the muting function.
The minimum duration of the muting function is calculated using the following formula.
The material length l
goods
and conveyor speed V
conveyor
are needed for this.
To calculate the minimum duration of the muting function, a material length l
goods
of
less than 500 mm is not permitted.
T
Min
= (l
goods
– tolerance) / V
Conveyor
+ T
Clearance
= T
clock period
× ( a
overflow
–1)
Recommended value for
tolerance
: 0.1 m
If
l
goods
- tolerance
is less than 0.5 m, the value must be rounded up to 0.5 m.
We recommend that you define the clock period Tclock period first. The overflow value
to be set for the respective function block can then be calculated using the following
formula.
a
overflow
= (l
goods
– t
olerance
) / (V
Conveyor
× T
clock period
) + (T
Clearance
/ T
clock period
) +1
CONFIGURATION
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8021675/ZV26/2019-05-13 | SICK
O P E R A T I N G I N S T R U C T I O N S | Safe Entry Exit
33
Subject to change without notice