Conveyor Applications; Network Fast Access For Conveyor Applications (Not Available) - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Advanced Operating Functions

8.23 Conveyor Applications

8.23 Conveyor Applications
For support of PLC based conveyor applications, there are three parts: A faster network access,
and PLC based HST mode, and PLC based damping. The following sections describe the
components of this application.
8.23.1

Network Fast Access for Conveyor Applications (Not Available)

Fast Access Enable
For direct PLC support for conveyors, fast network access is required for both new features.
A separate algorithm allows for retrieval of data for direct usage from the calling location. In this
algorithm, the call originates from the slow loop control, depending upon having a data
communication bandwidth high enough to be effective. This feature is enabled via menu
parameter ID 9971 "Fast Access Enable".
"Fast Access Enable" (9971) – in the Networks menu – picklist – "off, on" (default off) – used to
enable or disable the PLC Conveyor Application
If enabled, the Speed Demand and Torque Demand signals are updated within the slow loop
rather than the communication thread. This also requires that the "To Drive Register #N" be set
to "Speed Demand" and the "To Drive Register #N+1" parameter set to "Torque Demand" where
"N" is the first or base register of two. These parameters enable the fast register access, then scale
the inputs to PU torque and speed for use in the speed loop.
The scaled speed value is placed in the variable "Networks::SpeedDemand" while the scaled
torque limit is placed in the variable "Networks::TorqueCommand". These will be available for
both the PLC HST mode (enabled and not complete) and after completion for active damping.
Enabling and Using Fast Access
1. To enable this feature, Network 1 is required to be a valid network type. If it is not a valid
network type and the user attempts to enable this feature, the user will receive the message
"Network 1 not enabled" and the feature will not be enabled.
2. To use "Fast Access Enable", "Network Data to the Drive" register 2 must be used for speed
demand.
3. The next sequential register ("Network Data to the Drive" register 3) must used for the torque
demand. Since this register assignment is required for fast register access to operate
correctly, it will be automatically checked by the software when this feature is requested to
be enabled. If the register assignment is not correct and the user attempts to enable this
feature, the user will received the message "Register definition is not correct" and the feature
will not be enabled.
When enabled, this method imports and scales the speed reference and torque demand data
from the registers using the same scale factors as the employed by the normal network
communication for this data. This feature updates this data at the slow loop rate. Because this
method only applies to Anybus™ manufactured cards, the Modbus™ network will not be
available for fast access use.
Fast access does not speed up the transfer of data external to the control. If the network is slow,
the access will still operate at the same rate, but the data from read to read will remain
unchanged - with only the network determining the update of the data.
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NXGPro+ Control Manual
Operating Manual, A5E50491925A