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User Manual
Chapter 3
GFK-2721B
Sep 2019
Configuration
33
PROFINET IO-Controller, or the PROFINET IO-Controller will be unable to connect to the
devices and deliver their configuration.
The DCP tool must be connected to PROFINET IO LAN, either through the PROFINET
IO-Controller or directly to the LAN depending on whether it operates through the IO-
Controller or directly to IO-Devices.
3.4
After the Configuration is Stored to the IO-
Controller
For complete instructions, refer to the documentation for the IO-Controller and the
PROFINET IO configuration tool.
After successfully processing and applying its configuration data, the IO-Controller transfers
the configuration for remote IO-Devices over the PROFINET network.
PROFINET delivers IO-Device configurations when the IO-Controller establishes an
Application Relationship (AR) with the IO-Device. If all Application Relationships (ARs) are
lost, the IO-Device (such as a VersaMax PROFINET Scanner) does not change the
configuration of any of its IO sub-modules. Each sub-module retains the most recent
configuration received since it was last powered up or restarted. If a sub-module has not
been configured since powerup or restart, it remains in its hardware default condition.
When the AR(s) are re-established and a configuration is sent to the IO-Device, and the
configuration of a sub-module has changed, the IO-Device applies the new configuration.
If a PROFINET Scanner is powered up and its modules are at hardware defaults, when it
receives a configuration for the first time, any new defaults that are different from hardware
defaults are applied until the first output data arrives.
If a PROFINET Scanner is powered up and the connection is then lost after receiving a
configuration, configuration defaults are applied when the connection is lost. On a
subsequent connection, if the same configuration is sent, outputs remain at the
configuration defaults until the first output data arrives. If a different configuration is sent,
output defaults transition to the new defaults until the first output data arrives.
3.5
Output Operation
Module hardware defaults are typically zero for VersaMax modules, so until configuration is
stored by the IO-Controller, outputs remain at zero. When the configuration is stored, the
outputs immediately transition to their configured default operation. Outputs remain at
these defaults until the first valid outputs are received from the IO-Controller. The amount
of time outputs remain at defaults is a function of the IO-
Controller’s design and the
communication rate configured between the IO-Controller and PROFINET scanner.
For example, if a discrete module is configured for a default value of 1 and there is a current
value of 0 in the CPU, on power up the output will be zero, then transition to 1 and then
return to 0 when the output data is received