Manual

Installing Block I/O
Chapter 2
2-15
Certain products are not compatible with extended node capabilities
obtained with the use of 82 ohm terminators. The following table lists
those products that are not compatible.
Device Series
Scanners - 1771-SN All
1772-SD All
1772-SD2 All
1775-SR
1
All
1775-S4A
1
All
1775-S4B
1
All
Adapters - 1771-AS All
1771-ASB Series A
1771-DCM All
Miscellaneous - 1771-AF All
1771-AF1 All
1
When using PLC-3 programmable controllers, you must use a
1775-S5 or -SR5 scanner module. Do not use 1775-SR, -S4A
or -S4B scanner modules.
1791 high-density block I/O modules (64 and 128 input/output) have
internal fusing. Each group of 16 output points is protected by a 5.0A fuse.
These fuses protect the user output devices. They do not protect each
individual output from overload. It is recommended that individual outputs
be fused externally to protect the individual output circuit.
Catalog Number Voltage
Maximum Output Rating at:
30
o
C 60
o
C
Maximum Surge Current
1791-IOBX
24V dc
300mA per point
2.4A continuous per 16 point group
10A 25
1791-IOVX
24V dc
2
.
4A
continuous per
16
point group
maximum surge current 1.0A for 25ms
1 pulse per second maximum
Consult the factory for fuse recommendations.
In this chapter you learned how to physically mount your block I/O, make
power wiring connections, how to make the input/output wiring
connections to the block, and how to terminate the remote I/O link.
Compatibility of 1771 I/O
Products with Extended
Node Operation
Fusing
Summary