Reference Manual User Manual

1 Publication 1747-RM623D-EN-P - June 2006
Chapter 2
Prepare to Use the ControlNet Scanner
What This Chapter Contains
Read this chapter to understand how to use your ControlNet
1747-SCNR Scanner. The following table describes what this chapter
contains and where to find specific information.
What Your Scanner Does
In a typical configuration, the scanner acts as an interface between
ControlNet devices and an SLC processor. The scanner communicates
with ControlNet devices over the network to do this:
• Read inputs from a device.
• Write outputs to a device.
• Issue native ControlNet requests to a remote node on the
ControlNet link (CIP client).
• Download configuration data.
Communicating with Your
SLC Processor
The scanner communicates with the processor in the form of M1/M0
File Transfers and/or Discrete I/O (DIO). Information exchanged
includes the following.
• Device I/O data
• Status and control information
• CIP client requests and responses
• Local database
An M1/M0 file transfer is a method of moving large amounts of data
between an SLC 500 processor and its scanner.
Discrete input and output (DIO) is the transfer of one to 32 words
between an SLC 500 processor and a scanner. All 32 words of input
data and all 32 words of output data are updated on each SLC
program scan.
For Information About See Page
What your scanner does 2-1
Communicating with your SLC processor 2-1
Understanding ControlNet data transfer 2-3
Understanding 1747-SCNR mapping 2-5
Communicating with your devices 2-9