Omron CRT1 - 10-2009, Operation Manual

Page: 140 / 675

116
Basic Specifications of Slave Units
Section 4-1
4-1 Basic Specifications of Slave Units
This section gives the specifications that are the same for all Slave Units. For
specifications that vary with the Slave Unit, refer to the section for each Slave
Unit.
4-1-1 Communications Specifications
Item Specification
Communications protocol CompoNet Network protocol
Types of communications Remote I/O communications (programless, constant sharing of data with Slave Units)
and message communications (explicit message communications as required with
Slave Units and FINS message communications as required with PLCs)
Baud rate 4 Mbps, 3 Mbps, 1.5 Mbps, 93.75 kbps
Modulation Base-band
Coding Manchester code
Error control Manchester code rules, CRC
Communications media The following media can be used.
• Round cable I
• Round cable II
• Flat Cable I
• Flat Cable II
Note Round cable I, round cable II, Flat Cable I, and Flat Cable II are all different
types of cable. To use more than one type of cable at a time, Repeater Units
must be used to separate them on trunk lines and sub-trunk lines.
Communications distance and
wiring Refer to 1-2-1 Cable Types, Baud Rates, and Maximum Distances in the Master Unit
Operation Manual .
Connectable Master Units CompoNet Master Units
Connectable Slave Units CompoNet Slave Units
Maximum I/O capacity Word Slave Units: 1,024 inputs and 1,024 outputs (2,048 I/O points total)
Bit Slave Units: 256 inputs and 256 outputs (512 I/O points total)
Maximum number of nodes Word Slave Units: 64 input nodes and 64 output nodes
Bit Slave Units: 128 input nodes and 128 output nodes
Repeater Units: 64 nodes
Bits allocated per node address Word Slave Units: 16 bits
Bit Slave Units: 2 bits
Maximum number of nodes per
segment 32 nodes (including Repeater Units)
Applicable node addresses Word Slave Units: IN0 to IN63 and OUT0 to OUT63
Bit Slave Units: IN0 to IN127 and OUT0 to OUT127
Repeater Units: 0 to 63
Repeater Unit application condi-
tions Up to 64 Repeater Units can be connected per network. When Repeater Units are
connected in series from the Master Unit, up to 2 extra segment layers can be created
(i.e., up to 2 Repeater Units are allowed between a Slave Unit and the Master Unit).
Signal lines Two lines: BDH (communications data high) and BDL (communications data low)
Power lines Two lines: BS+ and BS
−
(power for communications and internal Slave Unit circuits)
• Power is supplied from the Master Unit or Repeater Units.
Connection forms Round cable II or Flat Cable I/II at baud rate of 93.75 kbps: No restrictions
Other cables or baud rates: Trunk line and branch lines
Connections for Slave Units and Repeater Units: T-branch or multidrop connections