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Appendix A Specifications
A.1 TC-net 100 Transmission Specifications
Table A-1 Ethernet Transmission Specifications
Item Specifications
Media access DOMA (Deterministic Ordered Multiple Access)
Transmission rate 100 Mbps
Topology Star type
Transmission line Single bus (future)
Dual bus
Transmission cable, cable
length
• Optical fiber cable: 2 km
(extendable up to 8 km using laser light emitting diodes and optical fiber single
mode)
• Twisted-pair cable: 100 m
No. of nodes 254 nodes maximum per system
(Optical shared hubs UTNH21As included in the number of nodes)
No. of hub levels 2 hubs high, cascaded
Transmission mode Scan transmission
High-speed cycle: 1 ms to 160 ms
Medium-speed cycle: 10 ms to 1,000 ms
Low-speed cycle: 100 ms to 10,000 ms
Message transmission
TCP/IP message transmission/reception
Scan transmission capacity 128 kW per system (16 bits per word)
2048 blocks per system (64 words per block)
Transmission capacity: 576 blocks per node (36 kW per node)
Status change detection
No. of change detection words: 128 W per node
Change detection cycle: No. of change detection words x 30
µs
Detection signal intervals: 50 ms or more
Interface Optical: MT-RJ optical connector
Electrical: RJ45 modular connector
Cable Optical: Quartz GI cable (62.5/125 long wavelength) or 50/125, long wavelength)
Electrical: Enhanced category 5 twisted-pair cable
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