Technical Data; System Response Times - Leuze electronic MSI 400 Operating Instructions Manual

12

Technical data

12.1

System response times

The response time is the time that is required to activate the safety function.
Example: The time from which the safety light barrier is crossed until the machine stops.
In order to determine the response time of the MSI 400system, use the standard time plus the filter and test
times.
Factor 1: Standard time
Maximum ON-OFF time from input to output without filter and test times:
Tab. 12.1: Calculating the time values
Input MSI 4xx
2 x cycle time + 3.6 ms
11.8 ms
2 x cycle time + 6.9 ms
• The cycle time must be obtained from MSI.designer (lower right).
• FSO = Fast Shut-Off: This function can be used to achieve quicker switch-off times from input to output
inside the module. FSO is a functional component in the MSI.designer.
Factor 2: Filter time
When the ON-OFF filter is activated, the switch-off signal is delayed by the filter time set. This filter can be
activated for each input in the MSI.designer and acts upon the response time with + 8 ms.
Factor 3: Test times
If the input tests are carried out in single-channel input circuits with the assistance of tests outputs T1 to T4
or X1 to X8, this results in the response time for test times > 1 ms from the test time plus response time
(wait time until the test pulse occurs).
Tab. 12.2: Response times
MSI 4xx
12 ms
When using user-defined elements (software manual) the response time can also be extended in two-chan-
nel input circuits if the selected test time is greater than 0.5 * test period minus 12 ms. The resulting addi-
tional response time should be calculated as follows:
additional response time = test time + 12ms - 0.5 * test period
(Only a positive result is evaluated, negative values are equal to zero)
For applications with a safety mat, the test period of the test generators connected must be applied to the
response time. The following table provides the reaction times for the correspondingly set test periods.
Changed reaction times!
From build state D 03.01 of the MSI 4xx modules and B 08 of the MSI-EM-IO84 modules, the
longer response times given in the table below apply.
In particular, for existing projects with sensor elements for safety mats and bumpers, this exten-
sion of the response times must be adhered to (e.g. in the case of replacement of a MSI 4xx
module).
Leuze electronic
Input MSI-EM-IO84 / MSI-EM-I8
2 x cycle time + 7.2 ms
2 x cycle time + 10.6 ms
-- 8.6 ms
MSI-EM-I8 / MSI-EM-IO84
With the test pulse time set to 4ms ≤ t
8 ms
With the test pulse time set to t
12 ms
WARNING
--
≤ 12 ms:
p
> 12 ms:
p
MSI 400
Technical data
Output MSI 4xx
FSO MSI 4xx
Output MSI-EM-IO84
FSO MSI-EM-IO84
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