Rockwell Automation 57C445 AutoMax PC Link Interface Module - Manual (Page 44)

D3Ć4
configuration buffers with any updates it receives over the network.
See section 3.2 of this appendix for more information on drop
configuration.
3.2 Drop Configuration
The Reliance Remote I/O network protocol uses configuration
packets" to define the slot/register allocations for a given drop. These
configuration packets are sent on the network only when a drop first
comes on line" with the Master. The RERIO software will capture
these configuration packets and place them in the CNF_BUF area. If
the PC Link module is started after a real drop is already active, the
module has no way to determine the configuration for the given real
drop. In order to ensure that the module has configuration
information for all real drops on the network, the user can disconnect
the Master and then reĆconnect it. When reĆconnected, the Master will
request configuration packets from all the real drops, and the PC
Link module will capture them as they are sent to the Master.
The configuration packet defines the model number, hardware type,
and slot/register configuration for a given drop. Table 4 defines the
format of a configuration packet:
Table 4 - Configuration Packet
CNFąBUF
Offset
Field
Name
Size
(bytes)
Description
0-3 NOTąUSED ăă4
Do not use these locations; RERIO will
fill them in.
4-15 MODąDES ă12
This 12 byte ASCII field describes the
model and revision of the given drop.
This is 419451Ć0xxx " for a remote
rack, and 419451Ć1xxx " for a Remote
Head. xxx is the revision of the module,
and the last character must be a
space.
16-143 SLOTąMAPS 128
Slot maps for the given drop. There are
16 slot maps, each containing one
double word for the outputs, and one
double word for the inputs.
144-145 INPUTąMAP ăă2
A one word value which defines the
input bit map for a given I/O Head.
This field is not used for an I/O rack.