Description of the RFC 4072S
108580_en_02 PHOENIX CONTACT 33 / 272
Determining the necessary times
DAT For the cycle time of the F-Devices, please refer to the device-specific user doc-
umentation for the F-Devices used.
Bus The “Bus” value is the sum of all the following times in the network/bus system
used:
1. External bus runtime in the network:
– Update time of the I/O data between PROFINET controller and device
set via the “Reduction ratio” multiplied by the “Monitor factor” (multiplier
of the update time).
The result (monitor time) determines the time at which the communi-
cation link is disconnected if no cyclic data has been transmitted in the
specified time (see Figure 2-5).
Figure 2-5 “Settings” editor of the interface editor group of the
PROFINET device (settings of the AXL F BK PN or
AXL F BK PN TPS PROFINET bus coupler)
– Relevant runtime components in bus heads (bus coupler or control-
lers) and backplane buses of modular systems.
For these values, please refer to the manufacturer’s information.
– Any runtimes within infrastructure components.
For these values, please refer to the manufacturer’s information.
2. Internal bus runtime within the RFC 4072S
– The internal runtime of the RFC 4072S, which is to be taken into con-
sideration in the “Bus” value, is equivalent to one iSPNS 3000 cycle
(T
ZSPNS
)
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