Omron 3G8F7-CRM21, User Manual

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CompoNet Network Specifications
Section E-1
E-1 CompoNet Network Specifications
E-1-1 Communications Specifications
*1: Slave Units that are pre-connected with cables are not usable at this data
rate. Because the data rate does not support T-branch connection, which
is the only possible connection for the Slave Units with pre-connected
cables.
*2: Round cable I, round cable II, Flat Cable I, and Flat Cable II are all different
in cable type. When two or more of them are to be wired in a network, a
Repeater Unit must be used to separate the cable for the trunk line and for
a sub-trunk line.
*3: Use the node address of the Word Input Slave Unit for a Word Mixed Slave
Unit. Use the node address of the Bit Input Slave Unit for a Bit Mixed Slave
Unit.
Item Specifications
Communications protocol CompoNet Network protocol
Types of communications Remote I/O communications, i.e., program-less, constant data sharing with Slave Units; and
message communications, i.e., occasional (as required) explicit message communications with
Slave Units and occasional (as required) Explicit message communications with PLC
Data rate 4 Mbps *1, 3 Mbps, 1.5 Mbps or 93.75 kbps
Modulation Base band
Coding Manchester code
Error control Manchester code rules, CRC
Communications media
*2 Round cable I (2-conductor cable) and Round cable II (4-conductor cable), Flat Cable I (DCA4-
4F10) and Flat Cable II (DCA5-4F10)
Communications
distance and wiring See Appendix E.1.3.
Connectable Slave Units CompoNet Slave Units
Maximum I/O capacity Word Slave Units: 1,024 inputs and 1,024 outputs, 2,048 points in total;
Bit Slave Units: 256 inputs and 256 outputs, 512 points in 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 trunk line or
sub-trunk line 32 nodes including Repeater Units
Applicable node
addresses *3 Word Slave Units: IN0 to IN63 and OUT0 to OUT63;
Bit Slave Units: BIT IN0 to IN127 and BIT OUT0 to OUT127;
Repeater Units: 0 to 63
Condition to use
Repeater Units Up to 64 Repeater Units can be connected per network or Master Board. (Up to 32 Repeater
Units can be connected per trunk line or sub-trunk line.)
Repeater Units can be connected to create a maximum of 2 segment layers from the Master
Board.
Signal lines Two lines: BDH (communications data high) and BDL (communications data low)
Power lines Two lines: BS+ and BS
−
(power for communications and for internal circuits of Slave Unit
supplied from the Master Board or a Repeater Unit)
Communications
power voltage 24 VDC
±
10%
Connection forms When either Round cable II or Flat Cable I or II is used at data rate setting in 93.75 kbps: No
restriction
Other cables or other data rates: Trunk line-branch line formation
Connections for Slave Units and Repeater Units: T-branch or multidrop connections