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Quantum automation platform 4
I/O architectures
Distributed I/O, Modbus Plus
The Modicon Quantum automation platform delivers a distributed I/O (DIO) architecture that provides cost-effective and
flexible solutions for controling and monitoring I/O signals over a wide area. The Quantum DIO architecture uses the
same I/O modules as a local or remote I/O (RIO) subsystem, and reduces installation costs by using low-cost,
twisted-pair cables. A special DIO drop adapter with a built-in power supply is used at each drop.
Quantum DIO drop adapters are specifically designed to link Quantum I/O modules to the head via twisted-pair shielded
cable. A drop adapter also provides the I/O with power (maximum 3A) from a 24 V d.c. or 115/230 V a.c. source. DIO drops
may also be powered by standard Quantum 8 A power supply modules, in which case the 3 A supply built into the drop
adapter is not used.
A DIO drop is smaller than an RIO drop, but more drops can be supported and they can be spread over a wider area than
an RIO network. RIO supports a linear configuration up to 4500 m (15 000 ft) long, while the DIO architecture supports up
to three network heads per CPU and up to 1800 m (6000 ft) per network (using RR85 repeaters). Even greater distances
canbeachievedusingfiberopticrepeaters.
The DIO architecture is based on Modbus Plus technology. A DIO network can support 32 nodes over 500 m (1500 ft);
by using repeaters, the DIO network length can be extended to 2000 m ( 6000 ft) and can support up to 64 nodes. Up
to three DIO networks are supported – one is native to the CPU itself, and the other two are available by adding optional
140 NOM 211 x0 or 140 NOM 212 x0 network interface modules into the Quantum backplane. With three DIO networks,
a single CPU can support 189 drops of I/O. DIO can be combined with RIO in the same CPU system for significantly larger
I/O counts.
All products that currently support Modbus Plus can coexist on the DIO network. For example, a programming panel can
be connected to the DIO network to monitor and troubleshoot an operating control system from the remote site, without
running a separate communication link. In addition, HMI devices like a PanelMate Plus or FactoryMate Plus can
participate on the network to reduce the number of networks required for a system. Distributed systems can have HMI
devices at remote stations without either a separate communications link or a local controller present, which significantly
reduces hardware and installation costs.
Presentation
Typical Multi-Network Distributed I/O System
7 8 9
4 5 6
1 2 3
0 •
RUN
ESC
ENT
STOP
F1 F2 F3
Modbus Plus to host interface
I/O only DIO network #1 - to 63 drops w/repeater
DIO DIO
DIO Momentum Altivar 66
Variable speed
AC drive
PC
Momentum
Multifunction DIO network #2 - to 63 nodes w/repeater
Presentation
0
(373 Seiten)
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