User manual

Choosing Hardware
Chapter 2
2-4
Select I/O adapter modules to interface your PLC-5 processor with I/O
modules. Use Table 2.D as a guide when you select I/O adapter modules.
Table 2.D
Guidelines
for Selecting Adapter Modules
Choose: When your requirements are:
1771AS or 1771ASB
1
Remote I/O Adapter Module
(or 1771AM1, AM2 chassis
with integral power supply and
adapter module)
a remote I/O link with:
• 57.6 kbps with a distance of up to 10,000 cable feet or
• timing that isn't critical enough to place I/O modules in a processor local
I/O chassis or an extendedlocal I/O chassis
1771ALX ExtendedLocal I/O
Adapter Module
an extendedlocal I/O link with timing that is critical and all extendedlocal
I/O chassis are located within 100 ft of the processor.
1
1771ASB series C and later have 230.4 kbps communication rate in addition to 57.6 kbps and 1 15.2 kbps.
17 71AS/ASB Remote I/O Adapter Modules
Table 2.E shows the I/O density per module and addressing modes you can
use with I/O chassis and remote I/O adapter modules.
Table 2.E
I/O
Chassis/Adapter Module Combinations
Remote I/O Adapter I/O Density
Addressing
Remote
I/O
Adapter
Module Cat. No.
I/O
Density
per Module
2Slot 1Slot 1/2Slot
1771AS 8
16
32
Yes

1
No
No
No
No
No
No
No
1771ASB
Series A
8
16
32
Yes

1
No
Yes
Yes

1
No
No
No
1771ASB
Series B, C, and D
8
16
32
Yes

1
No
Yes
Yes

1
Yes
Yes
Yes
1771AM2 8
16
32



Yes
Yes

1
Yes
Yes
Yes
1
Conditional module placement; you must use an input module and an output module in two
adjacent slots (even/odd pair) of the I/O chassis beginning with slot 0. If you cannot pair the
modules this way
, leave the adjacent slot empty .
Using the 1771-ASB Series C or D adapter module, you can choose one of
three communication rates: 57.6 kbps, 115.2 kbps, or 230.4 kbps.
Selecting I/O Adapter
Modules
ALX
ASB