iControlr PROFIBUSr, PROFINETr, DeviceNett, and EtherNet/IPt Generation 4 Slot 9 Gateway
8
Part 1605930−02
E 2020 Nordson Corporation
Software
Overview
A typical PLC−based powder system utilizing iControl’s control modules
consists of two basic sub−systems:
S a PLC which controls the triggering of several guns
S a network of several intelligent powder flow (either iFlowr or Pump Flow
Control PCB [PFCP]) and gun KV control modules.
Since the iControl system uses separate intelligent modules (or nodes) for
controlling powder flow and gun voltage, the PLC, at times, must have the
capability to communicate to 2 nodes for controlling a single gun.
Furthermore, since each flow or KV control node has 2 channels for
controlling two guns, each intelligent node must process data and control
information for 2 separate guns. All of the control nodes are networked
together on a proprietary CAN bus which acts as the channel through which
all data and commands to and from the nodes are sent.
Each Gateway is designed to appear as a single slave device to the PLC
master, regardless of the number of gun control nodes in the system. Inside
the Gateway, the interface between the 2 networks is a dual port memory
device which is organized such that all data/commands have a unique
address which can be accessed by either network.
This section describes the specifications required to send commands to the
flow/gun nodes so that they may perform their intended functions. In
particular, the layout of the dual port memory is defined by describing the
function and/or range of values which occupy each address location. The
method for retrieving process data from the slave nodes, via reading the
dual port memory, is also specified.
Throughout this document, the gun flow, gun pump and gun voltage control
nodes will be collectively referred to as gun control nodes. For each gun in
the system, there is a KV node which controls that gun’s electrostatics; and
there can be either a gun flow (iFlow) node or a gun pump (PFCP) node,
but not both, to control that gun’s powder flow.
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