iControlr PROFIBUSr, PROFINETr, DeviceNett, and EtherNet/IPt Generation 4 Slot 9 Gateway
13
Part 1605930−02
E 2020 Nordson Corporation
Output Image Table
See Table 2.
All of the data contained in the Output Image Table are written by the PLC
to its master IO memory space. A general description of how the data of
the PLC’s output image table flows through the system until it arrives at the
gun control nodes follows. The PLC writes the data to the relative
addresses shown as “Address Offset” (See Table 2) representing locations
in the PLC’s output image table. The fieldbus master sends this data to the
Gateway’s fieldbus slave where the data is written to the dual port memory
by the slave’s controller. The relative address of the data in the dual port
memory is identical to the Address Offset used by the PLC. Finally, the data
is read from the dual port memory by the Gateway’s DSP controller and
processed to create a CAN message. This message is sent to the gun
control node(s) on the CAN network.
Module 1
When the Gateway detects a new non-zero value in the first byte of Module
1, it will send a broadcast message to all nodes.
Module 2
When the Gateway detects a change has taken place in Module 2, it will
send a multicast message out to the two nodes (KV and Flow/Pump)
associated with the specified gun number.
Module 3
When the gateway detects that a change has taken place in the KV
parameters of Module 3, it will send a unicast message out to the specified
gun’s KV node. If the flow parameters in Module 3 changed, then the
gateway will send a unicast message to the specified gun’s flow (or pump)
node. If the gateway detects changes to both KV and flow parameters, it will
send two unicast messages out; one to the specified gun’s KV node and
another to the flow/pump node.
Module 4
This module is a single byte value equal to a Page Number, used by the
PLC’s Operator Interface. This value, starting with 0, tells the Gateway
which group of 4 guns is currently being displayed on the PLC. For
example, if this value were equal to 3, then the PLC is currently displaying
guns #13 thru #16.
Module 5
This module commands all the flow controls to change its flow rates by a
percentage of the setpoint. A detailed description of this module is
discussed on page 22 under Flow % Adjust Message.
Module 6
This module tells the Gateway that the PLC is active and executing its
program. The value in this single byte must change to any new value, at
least, every 5 seconds. It is practical for the PLC to change this value every
second. If the Gateway does not detect any change in this value for 5
seconds, a broadcast message shutting off all the guns will be sent. To
visually verify that the PLC is periodically sending heartbeats, note the
green Status LED on the KV card. The light will toggle ON and OFF every
time a new value in Module 6 is stored.
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