Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 103)

Chapter 6
Using the Ethernet Interface
6-22
INTERD is a PCCC INTERCHANGE server daemon that provides
communication between the control coprocessor, its attached PLC-5
processor, and a host computer running INTERCHANGE software via the
Ethernet connection of the coprocessor.
INTERD is included in revision 1.20 or later of the PCBridge software
(1771-PCB) and requires Series A Revision E (1.30) or later firmware in
the control coprocessor.
INTERCHANGE is an Allen-Bradley application-programming interface
(API) that allows easy, consistent programmatic access to control-system
information.
By installing the INTERD daemon on the control coprocessor, you have
the ability to do the following over the Ethernet network:
run 6200 Series PLC-5 Programming Software on a host computer to
program or monitor a PLC-5 processor connected to the coprocessor.
run an INTERCHANGE program on a host computer to access the data
table of the PLC-5 processor connected to the coprocessor.
run an INTERCHANGE program on a host computer to access the TAG
table of the coprocessor.
access the data table of the PLC-5 processor connected to the
coprocessor from a remote Ethernet PLC-5 processor by using the
message instructions.
Introduction to INTERCHANGE Access
to CoprocessorĆTagged Memory
You can route INTERCHANGE messages to the control coprocessor when
you give the coprocessor its own station number. You do this via the
CC_CFG utility. Any messages that the control coprocessor receives that
are not addressed to the coprocessor are routed to the PLC-5 processor if it
is connected.
INTERCHANGE accesses the TAG table of the control coprocessor using
the DTL_PCCC_DIRECT function call. You read or write tagged data by
issuing a PCCC typed read or write command of undefined type with an
element size of 1 byte.
Using the INTERD
INTERCHANGE Daemon