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13.5 PROFINET IO
13.5.1 Overview
The interface card supports two different types of PROFINET data transfer. One
type is entirely user-configurable, and is utilized when a standard I/O module is
chosen during network configuration. The other type is a module that is compliant
with the PROFIdrive profile.
Some other notes of interest are:
• Supports real time (RT) communication.
• A total of 85 modules are available for selection by the controller (84 standard I/O
modules and one PROFIdrive module). The standard I/O modules follow the
naming conventions of “IN:XX, OUT:YY”, where XX is the number of input
(status) registers to be sent to the controller, and YY is the number of output
(command) registers to be sent to the drive. The single PROFIdrive profile-
compliant module is named “Standard Telegram 1”. Refer to the GSDML file for
specific module information.
• When using standard I/O modules, up to 8 command registers can be sent to the
drive, and up to 32 status registers can be retrieved from the drive.
• No explicit module selection is required on the interface card: the module will be
selected automatically according to the controller’s configuration.
• The lowest recommended I/O Cycle Update Time (in Step 7 or an equivalent
hardware configuration tool) is 8ms. Lower update times are possible but
determinism may vary depending on the interface’s processing load. Note that
this setting is not related to, and should therefore not be confused with, the
Update Time setting on the embedded web server’s PROFINET tab.
• If the RT connection timeout occurs, the driver will trigger a timeout event as
described in section 10.7.5. The timeout value is dictated by the PROFINET
controller and is at least three times the IO Cycle update time. The timeout value
is also known as the “IO Cycle Watchdog” time.
• The interface card supports PROFIdrive profile V4.1. For more information on
PROFIdrive communications, refer to the PROFIdrive Profile Drive Technology
Technical Specification for Profibus and PROFINET (Profibus International order
#3.172.)
• Any available drive register can be accessed via PROFINET acyclic services.
The record index (unless reserved) directly corresponds to a register number
(section 9).
• Standard I/O module configuration: if a register entry in the command data
configuration array is 0, then any commanded data that corresponds to that
location will be ignored. Conversely, if a register entry in the status data
configuration array is 0, then any status data that corresponds to that location will
be a default value of 0. Refer to section 10.5.3 for further information on the data
configuration arrays.