Appendix 1. Specification
30
Appendix Table 1.1 Serial bus specifications
Item Specification
Transmission line configuration Shielded twisted pair cable
Number of connected nodes Up to 30 serial bus communication modules such as SBIF when
redundant
Transmission line length Up to 30m (for wiring inside the housing only)
Transmission speed 1Mbps
Transmission format IEEE 802.4-compliant
Topology Multi-drop
Transmission line impedance
100
Ω
Bus redundancy Standard redundancy
Module redundancy Redundancy of communication module is available
Appendix Table 1.2 I/O bus specification
Item Specification
Transmission line configuration Cable connection between terminal block units
UIOU12 internal module
connection count
Up to 4 modules when single
Up to 8 module when redundant (Up to 16 module at ULCU12)
Transmission speed 19.2kbps
Transmission method Asynchronous system
Interface level RS-485
Topology Multi-drop
Transmission line impedance
100
Ω
Bus redundancy Standard redundancy
Error detection CRC 16-bit frame inspection sequence
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