Triconex Trident, Planning And Installation Manual

Page: 43 / 274

System Overview 27
Chapter 3 System Description
Configuration
An assembly consists of a module and a baseplate. Three types of assemblies are
available:
• Main Processor
• Communication
• I
⁄
O
A basic Trident system consists of one MP assembly, an optional CM assembly,
and up to 14 I
⁄
O assemblies. If AO or PI Modules are included, up to 10 I
⁄
O
assemblies are allowed.
Assemblies are configured into a system on a mounting plate using interconnect
assemblies, extenders, I
⁄
O bus cables, and I
⁄
O bus terminators. I
⁄
O modules
communicate with the MPs by means of a triplicated, RS-485, bi-directional
communication bus, called the I
⁄
O bus.
The I
⁄
O bus cable can be used to join I
⁄
O columns. Maximum cable length is up to
6 meters (20 feet) without termination or up to 200 meters (650 feet) with
termination.
Typical System
Configuration
Input Module
Hot Spare
Field
Input
Input
Channel A
Input
Channel B
Input
Channel C
Tr
iB
u
s
&
Tr
iT
im
e
D
iagnos
ti
c
C
hannel
Channel A I/O Bus
Field
Output
Channel B IO/ Bus
Channel C I/O Bus
MP A IOP A
MP B IOP B
IOP C
(SX)
(SX)
(IOX)
(IOX)
(IOX)
Output Module
Hot Spare
MP C
(SX)
Output
Channel A
Output
Channel B
Output
Channel C
O
u
tput
V
oter