Optical Connections in Wired Systems Section 2-4
17
When connecting C500 Slaves to C200H Masters, each C500 Slave must be
counted as 2 Slaves when figuring the total number of Slaves. This total,
which includes all optical and wired Slaves, must be no greater than 5 for any
one C200H PC. Here, Special I/O Units can be mounted to C500 Slave
Racks. Word assignments will be based on the C500 PC’s System, i.e.,
based on the order and positions of I/O Units mounted (starting at the left),
and not on fixed slot words.
C200
Master
C500 Slave
C500 Slave Rack
C200H PC
C500 Slave
C500 Slave Rack
2-4 Optical Connections in Wired Systems
Two B500-AL007-P Link Adapters can be used to extend the transmission
distance and/or to prevent interference from noise by inserting an optical link
between two Remote I/O Units. The two Link Adapters convert between wire
and optical signals, transmitting over the optical link between them. The
AL007-P Link Adapter is thus always used in pairs, and always between
Wired Remote I/O Units. The entire Master Subsystem, from Master to termi-
nator, must still be connected in series.
Up to 8 Link Adapters (4 pairs) can be used for each Master. To take full ad-
vantage of an optical link, shorten wire links as much as possible, even to the
point of placing the Link Adapter on the same control panels as the Remote
I/O Units.
Maximum cable length for any one section of optical cable is 20 m for
all-plastic optical fiber cable (APF); 200 m for plastic clad optical fiber cable
(PCF).
Refer to the Link Adapter manual for details on this and other uses of Link
Adapters.
Link
Adapter
B500-AL007-P
Link Adapter
B500-AL007-P
APF/PCF
optical
cable
RS-485
cable
C500 CPU Rack
C500 Master
C500 Slave
C500 Slave Rack
RS-485 cable
Remote
Interface
Terminator
I/O Block
Example 2: C200H Master
and C500 Slaves
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