Filter
Top Products
4-4SectionWired Remote I/O Systems
22
4-4 Wired Remote I/O Systems
Wired
Remote I/O Master Units, Remote I/O Slave Units,
and Remote T
erminals
can
be directly connected with RS-485 cable, which has a maximum transmis
-
sion distance of 200 m. In order to extend the transmission distance and/or to
reduce
noise interference, a pair of AL007-P Link Adapters can be used to insert
an
optical link between any two Remote I/O Units/Remote T
erminals. The follow
-
ing
example shows two Wired Remote I/O Units connected by optical fiber cable
by using a pair of AL007-P Link Adapters.
Link
Adapter
AL007-P
Master
, Slave, or
Remote T
erminal
Optical fiber (APF/PCF)
Link Adapter
AL007-P
Master
, Slave, or
Remote T
erminal
RS-485 cableRS-485 cable
The
Link Adapters must always be used in pairs, as they convert between wire
and
optical signals, thereby allowing optical transmission between Units which
cannot
themselves be connected directly to optical fiber cable. The entire Sub
-
system,
from Master to
terminator
, must be connected in series, with no branch
-
ing.
Up to 8 Link
Adapters (4 pairs) can be used for each Master
. The following
diagram
illustrates an acceptable
configuration for a Wired Remote Master Sub
-
system,
using the maximum of 8 Link Adapters for one Master
. Note that all
Units
are connected in series and all Link Adapters are used in pairs.
Wired
Slave
Wired Slave
Link Adapter
AL007-P
**
Optical fiber
(APF/PCF)
* RS-485
cable
Link Adapter
AL007-P
Link Adapter
AL007-P
Link Adapter
AL007-P
Wired SlaveWired Master
Link Adapter
AL007-P
Wired Slave
Link Adapter
AL007-P
Link Adapter
AL007-P
Terminator
Link Adapter
AL007-P
Link Adapter
AL007-P
Wired Slave
***
**
**
**
***
*
* * ** *
Maximum
cable length for any single section of optical cable is 20 m for all-plas
-
tic
optical fiber cable (APF) and 200 m for plastic-clad optical fiber cable (PCF).
T
o take full advantage of an optical link, shorten wire
links as much as possible,
even to the point of placing the Link Adapter on the same control panel as the
Remote I/O Unit/Remote Terminal.