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Compatibility of 1771 I/O
Products with Extended
Node Numbers
Selecting Remote I/O
Link Speed
Certain products are not compatible with extended node capabilities
obtained with the use of 82 ohm terminators. Table 2.G lists those products
that are not compatible.
Table 2.G
Non compatible Products
Device
Scanners
1771 SN
1772 SD
1772 SD2
1775 SR
1775 S4A
1775 S4B
Adapters
1771 AS
1771 ASB
1771 DCM
Miscellaneous
1771 AF
1771 AF1
The remote I/O link can operate at three speeds: 57.6K, 115.2K or 230.4K
bits/s. The selection of link speed is dependent on the scanner/processor
used, throughput requirements, distance required and the type of remote
I/O devices being used.
Throughput Requirements
Block throughput using analog block is dependent on the controllers data
transfer rate. Analog block outputs are updated within 10ms of receiving
output data from the controller. The analog block inputs are sampled in a
"round robin" fashion with an input channel sampled every 27ms. This
means that a given input channel is sampled every 108ms (four input
channels times 27ms). At the end of every sample period of 27ms, the most
recent input data is made available for data transfer to the controller.
Consult your programmable controller user manual for Remote I/O
Communications to determine your system throughput.
Chapter 2
Installing Block I/O
Series
All
All
All
All
All
All
All
Series A
All
All
All
2-15
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