Item list of 3G8F7-CRM21 / 3G8F8-CRM21
| 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 controllers) *1 |
| Baud rate | 4 Mbps *2, 3 Mbps, 1.5 Mbps, 93.75 kbps |
| Modulation | Base-band |
| Coding | Manchester code |
| Error control | Manchester code rules, CRC |
| Communications media *3 | The following media can be used.
• Round cable I 2-wire 0.75 mm2 • Round cable II 4-wire 0.75 mm2 • Flat Cable I |
| Communications distance
and wiring |
Refer to 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 trunk line or sub- trunk line |
32 nodes (Slave Units and 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
conditions |
Up to 64 Repeater Units can be connected per network (i.e., per Master Unit). Up to 32
Repeater Units can be connected per trunk line or per sub-trunk line. When Repeater Units are connected in series from the Master Unit, up to two 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. |
| Communications power
supply voltage |
24 VDC ±10% |
| Connection forms | Round cable II (4-wire) or Flat cable I at baud rate of 93.75 kbits/s: No restrictions
Other cables or baud rates: Trunk line and branch lines |
| Connections for Slave Units and Repeater Units: T-branch or multidrop connections |
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