UTNH23A
Features of Optical Shared Hub Units
TC-net 100 is a monitor and control LAN for the Integrated Controllers, which can be
configured using optical fiber transmission lines and twisted-pair cable transmission
lines. The optical shared hub unit is necessary for configuring optical fiber transmission
lines, and connects TC-net 100 stations to the network.
The UTNH23A, which has SNMP for TC-net 100 mounted in it, permits diagnosis of the
ports connected to the optical shared hub unit.
The standard TC-net 100 has dual transmission lines, of which line A is for connecting
UTNH23A and line B for connecting UTNH23B.
The information and control network TC-net 100 has the following features.
• Open
The TC-net 100 is a monitor and control network featuring the open characteristic of
the 100-Mbps Ethernet, collision averting function, and definitive time response.
• Communication service
Communication service covers scan transmission (cyclic broadcast transmission and
reception) for periodic control data transmission and ordinary message transmission.
• Scan transmission has three modes: High-speed mode, medium-speed mode,
and low-speed mode. These modes can be assigned according to the data
refreshing cycle to assure definitive real-time response.
• Message transmission is supported by not only TCP, UDP, and IP but also the
Toshiba standard protocol PCMP.
• High reliability
High-reliability systems can be built by dual transmission line configuration. Electric
or optical transmission lines can be selected.
Note: PCMP is the abbreviation of Process Control Message Protocol.
UTNH23A
