Yaskawa SmartTrac AC1 - Manual (Page 48)

SMART TRAC AC1
5-2
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Networking the Smart Trac AC1 Technical Manual TM 3554-000
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Maximum segment lengths are: with a star network and coaxial cable -
2,000 feet; with a bus network and coaxial cable – 1,000 feet; with UTP
cable – 400 feet; with fiber-optic cable – 11,500 feet.
Each end of the network cable must be terminated with a 93 ohm plug, available
from MagneTek (see "Replaceable Parts List").For further details about Arcnet,
reference ARCNET Local Area Network Standard, ATA/ANSI 878.1, ARCNET
Trade Association, 1992.
Profibus – DP(Decentralized Periphery) provides open, standard, inter-operable
and fully transparent networking between field devices (i.e. Smart Trac AC1s)
and the controlling computers, PLCs and/or DCSs. It supports network speeds of
9600 bps to 12 Mbps over shielded, twisted 2-wire line. Data may be transferred
in 1 byte to 244 byte messages at distances up to 1200 meters. It permits a
maximum of 125 nodes.
DeviceNet is a simple, economical, networking solution to connect industrial
devices (i.e. limit switches, smart motor controllers, operator interfaces, and
variable frequency drives). Programmable controllers and computers may also
be networked using DeviceNet.
It supports network speeds of 125Kpbs, 250 Kbps and 500 Kbps. DeviceNet
cabling consists of a 5-wire cable containing a twisted pair for data
communications, a second twisted pair for network 24 VDC power, and a shield.
It permits a maximum of 64 nodes. Speed is slow, but throughput is high.
Modbus is an industrial communications network that operates via RS-232, RS-
485 or RS-722 that utilizes the PLC or PC as Master and a Smart Trac
AC1 as
Slave. It is an open network and often uses serial port communications at speeds
of 9600 bps to 19,200 bps. Using RS-232, it serves as a point to point (2-device)
network. Using RS-485, it permits a maximum of 31 Smart Trac AC1 nodes.
The most common use of ethernet cards with Smart Trac AC1 will be to permit
a faster, PC-based connection for monitoring the drive, program uploading to
the drive, downloading from the drive, and running diagnostics.
Ethernet generally transmits data at 10 Mbps to 100 Mbps. It was developed by
Intel, Digital (now Compaq), and Xerox as an “open” network standard,
meaning it can network computers using several operating system platforms.
Most types of Ethernet cards, compliant with the PC/104 footprint and Ethernet
standard 802.3, may be installed in your Smart Trac AC1 to provide the
interface for PC-based operation. Check with your MagneTek representative for
a list of Ethernet cards supported by MagneTek. Each Smart Trac is supplied
with one Ethernet card.
To set up an ethernet network, you will need the following:
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a laptop and/or desktop computer on which to run Smart Trac
Workstation.
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ethernet cabling to connect the various devices on the network.
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one or more Smart Trac AC1s.
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a hub, if connecting more than two devices on the network.
A typical PC-based network for operation of Smart Trac AC1s is depicted in
Figure 6.
Profibus - DP
DeviceNet
Modbus
Using Ethernet for
PC-based Operation