Toshiba TNB21, Instruction Manual, Page: 16 / 99

Chapter 1 Introducing the TNB
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1.1 Functions and Characteristics of the TNB
TNB module is an extended module for connecting the Unified Controller
Vm series to the information and monitoring control network TC-net 100.
TNB module uses optical fiber cable and provides both single bus and dual
redundant bus.
・
TNB21 : Optical fiber cable with single bus module.
・ TNB22 : Optical fiber cable with dual redundant bus module
The maximum of TNB21/TNB22 module that can be installed in the slot of
single(BUB11)/multi(BUB21)-base of Vm series Unified Controller are 3
and 1, respectively.
Characteristics of the TNB

Openness
The TC-net 100 is a network for monitoring control that maintains the
openness of the 100 Mbps Ethernet and has the collision avoidance
function and deterministic real time responsiveness.

Communication services
The communication services of TC-net 100 include scan transmission
(cyclic broadcast transmission) that transmits control data periodically.
Scan transmission has 3 modes; high, medium and low, which can be
assigned according to the data update cycle to ensure deterministic real
time responsiveness.

High reliability
Highly reliable system configuration is available with redundancy of the
transmission path.