Hardware Considerations
Chapter 2
210
CAUTION: For proper system data communications, a
local/remote system structure with 2 local racks, you must use a
1777-CA cable (3 ft./.92m) between the processor and the two
local racks. You must also use the 1772-CS cable (3 ft./.92m)
from the second local rack to the distribution panel.
The term “addressing mode” refers to the method of hardware addressing
within individual I/O chassis. Appendix A, Hardware Addressing, provides
a complete presentation on 2-slot, 1-slot and 1/2-slot addressing. In
general:
Local I/O chassis that are communicating through a 1771-AL Local I/O
Adapter module can only be 2-slot addressed.
Remote I/O that are communicating through a 1771-ASB Series A
Remote I/O Adapter module can be addressed in either 2-slot or 1-slot
modes.
Remote I/O that are communicating through a 1771-ASB Series B
Remote I/O Adapter module can be addressed in either 2-slot, 1-slot or
1/2-slot modes.
NOTE: Processor-to-I/O chassis communication requires the setting of
I/O chassis backplane switches. See the 1771-ASB Remote I/O Adapter
manual (publication no. 1771-6.5.37) for this information.
The Series C programmable controller’s power supply provides 4 amperes
of current to power local I/O chassis or the 1772-SD2 distribution panel.
When the total output current required to power these modules exceeds the
supply, or a core memory is issued, an auxiliary power supply must be
used. The total output current must not exceed the rating of the auxiliary
power supply.
The 1771-P2 power supply provides 6.5 amperes to power one bulletin
1771 I/O chassis with a maximum 128 I/O. This includes the adapter and
the I/O modules in the chassis.
This power supply may be operated from either a 120 or a 220/240V AC
source.
2.11
Hardware Addressing
Modes
2.12
Auxiliary Power Supplies
2.12.1
1771P2 Auxiliary Power
Supply
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