Rockwell Automation 1775-S5_SR5,D17756.5.5 User Manual PLC-3 FAMILY I/0 - Manual (Page 11)

Scanner Hardware and Installation
Chapter 1
1-2
Table 1.A
1775ĆS5, ĆSR5 Scanner Features and Functions
Features Functions
Four I/O communication
channels
Communicate with I/O adapter modules in an I/O chassis. You
can connect up to 32 I/O chassis to one I/O channel. The
scanner can communicate with up to 4,096 I/O.
I/O scan priority Scan the I/O chassis according to a sequence that you select.
DH/DH+ channel Communicate with other AllenĆBradley controllers and/or
computers on a DH or a DH+ channel. Also provides direct
connection for a programming device.
Status indicators Keeps you informed on the scanner's status including:
• forces in the system
• DH/DH+ channel
• I/O communication channels
Thumbwheel switch Distinguishes one scanner from another. You can have up to:
• 15 scanners in a PLCĆ3 system (S5 scanner)
• 2 scanners in a PLCĆ3/10 system (SR5 scanner)
Backup connector Transfers control to a backup PLCĆ3 or PLCĆ3/10 system if a
fault shuts down the primary system.
Terminal arm Makes connections to:
• 1771 I/O chassis up to 10,000 cable feet away from the
scanner via twinaxial cable (cat. no. 1770ĆCD) for I/O
communication
• Communication channels on scanners in up to six separate
PLCĆ3 or PLCĆ3/10 systems via twinaxial cable for
peerĆtoĆpeer communication
• Communication channel on a scanner in a backup PLCĆ3 or
PLCĆ3/10 system via twinaxial cable for backup
communication
Message procedure
commands
Easy to use commands that you can use to transfer data over
a DH or DH+ link and combine in procedures for:
• complex logic decisions, looping, and nesting
• symbolic representation of data and addresses
• embedded arithmetic expressions and logic operations
• error checking and reporting
• decimal, octal, or binaryĆcodedĆdecimal data entry
• functions for converting data values to and from BCD