User Manual Owner manual

Chapter 2
Planning to Use Your ControlNet
PLC5 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 MapT able Entries Required
DataTransfer T ype Number of Entries Required
1771 Discrete I/O Data Transfer
1 per adapter
1771 Nondiscrete I/O Data Transfer 1 or 2 per module
1794 Discrete and Nondiscrete I/O Data Transfer 2 per adapter
ControlNet PLC5 Peertopeer Communication 1 per message
Table 2.E
Files
That Y ou Configure with the I/O Map for Scheduled I/O Usage
File Description
Status File
Userspecified integer datatable file containing status information about all of the ControlNet network's scheduled I/O
maptable entries. Each entry has a statusfile offset field pointing to three status words associated with the entry.
Data Input File (DIF) Userspecified integer datatable file with a maximum of 1000 words. This space is used for both nondiscrete input data
and peertopeer input over the ControlNet network. Scheduled peertopeer inputs can also use the inputimage file.
Data Output File (DOF) Userspecified integer datatable file with a maximum of 1000 words. This space is used for both nondiscrete output data
and peertopeer output over the ControlNet network. Scheduled peertopeer outputs can also use the outputimage file.
Default Configuration File Userspecified integer datatable file used to store nondiscrete I/O data transfer configuration data when the automatic
mapping feature is used.
Table 2.F
ControlNet
I/O MapT able Entry Fields
MapTable 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 transferthe slot value does not apply because the mapping granularity is
based on the physical chassis
• 1771 nondiscrete I/O data transfer015, the slot number is always the physical slot location inside the
1771 chassis regardless of addressing mode within the chassis
• 1794 nondiscrete I/O data transfer07, the slot number is always the physical location in the 1794 system
• peertopeer communication116, 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 peertopeer message typePeer Out or Peer Inin offline and
online programming. It also determines how the maptable entries are configured for the different modules and
peertopeer 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 readonly field displays the actual time it takes for the network to update the requested data.