Rockwell Automation 1785-L20C_L40C, D17856.5.14 ControlNet PLC-5 Programmable Controllers User Manual - Manual (Page 37)

Chapter 2
Planning to Use Your ControlNet
PLCĆ5 Processor
2-9
Mapping ControlNet Data Transfer
The ControlNet I/O map table can contain up to 64 entries. Each map-
table entry corresponds to one transfer—either input or output—of data
between the ControlNet processor and an I/O rack, an I/O module, or
another ControlNet processor.
Table 2.D
Number of ControlNet I/O MapĆTable Entries Required
DataĆTransfer Type Number of Entries Required
1771 Discrete I/O Data Transfer 1 per adapter
1771 NonĆdiscrete I/O Data Transfer 1 or 2 per module
1794 Discrete and NonĆdiscrete I/O Data Transfer 2 per adapter
ControlNet PLCĆ5 PeerĆtoĆpeer Communication 1 per message
Table 2.E
Files That You Configure with the I/O Map for Scheduled I/O Usage
File Description
Status File UserĆspecified integer dataĆtable file containing status information about all of the ControlNet network's scheduled I/O
mapĆtable entries. Each entry has a statusĆfile offset field pointing to three status words associated with the entry.
Data Input File (DIF) UserĆspecified integer dataĆtable file with a maximum of 1000 words. This space is used for both nonĆdiscrete input data
and peerĆtoĆpeer input over the ControlNet network. Scheduled peerĆtoĆpeer inputs can also use the inputĆimage file.
Data Output File (DOF) UserĆspecified integer dataĆtable file with a maximum of 1000 words. This space is used for both nonĆdiscrete output data
and peerĆtoĆpeer output over the ControlNet network. Scheduled peerĆtoĆpeer outputs can also use the outputĆimage file.
Default Configuration File UserĆspecified integer dataĆtable file used to store nonĆdiscrete I/O data transfer configuration data when the automaticĆ
mapping feature is used.
Table 2.F
ControlNet I/O MapĆTable Entry Fields
MapĆTable Entry Field Description
Node and Slot/Message Numbers This is the entry's network location, currently defined as node.slot/message. The node value is the ControlNet
network address of the destination device. The slot/message value takes on different meanings with the
different communication options:
• 1771 and 1794 discrete I/O data transferĊthe slot value does not apply because the mapping granularity is
based on the physical chassis
• 1771 nonĆdiscrete I/O data transferĊ0Ć15, the slot number is always the physical slot location inside the
1771 chassis regardless of addressing mode within the chassis
• 1794 nonĆdiscrete I/O data transferĊ0Ć7, the slot number is always the physical location in the 1794 system
• peerĆtoĆpeer communicationĊ1Ć16, the message number represents one of sixteen scheduled peer
messages available per processor; and it must be the same for both processors involved
Module/Message Type This allows you to specify the module type or peerĆtoĆpeer message typeĊPeer Out or Peer InĊin offline and
online programming. It also determines how the mapĆtable entries are configured for the different modules and
peerĆtoĆpeer messages.
Expected Network Packet Time
(ENPT)
You set this to the maximum time allowed for the network to update the requested data.
Actual Network Packet Time (ANPT) This readĆonly field displays the actual time it takes for the network to update the requested data.