iPOINT X – Hardware User Manual | 18.06.2020
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10
2.1.1 LF Limitations for ATEX
Due to Barrier (VCL1520) and cable series resistance, it is not possible to operate LF with full power and 12 slots
all the time. Therefore, LF operation is limited by firmware according to the slot scheme and the restrictions below.
LF slot settings depending on configured LF power:
Configured LF
power
Minimum Delay
between LF
telegram
Minimum
Cycle delay
Description
0 to 39%
0 ms
10 ms
All slots active
40% to 59%
40 ms
10 ms
Only 6 slots per frame are active
(1 slot inactive between 2 actives slots)
60% to 79%
100ms
10 ms
Only 2 slots actives per frame
(5 slots inactive between 2 actives slots)
80% to 100%
500 ms
250 ms
Only 1 slot per double frame is active
ATTENTION: This is just an example. If you have other parameters, additional cable length or other voltage drops
between the Barrier and the iPOINT X the settings mentioned above will differ and can end in improper operation of
LF or even the whole device.
