Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 23)

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:
1771ĆAS or 1771ĆASB 1
Remote I/O Adapter Module
(or 1771ĆAM1, ĆAM2 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 extendedĆlocal I/O chassis
1771ĆALX ExtendedĆLocal I/O
Adapter Module
an extendedĆlocal I/O link with timing that is critical and all extendedĆlocal
I/O chassis are located within 100 ft of the processor.
1
1771ĆASB series C and later have 230.4 kbps communication rate in addition to 57.6 kbps and 115.2 kbps.
17 71ĆAS/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
2ĆSlot 1ĆSlot 1/2ĆSlot
1771ĆAS 8
16
32
Yes
ĆĆ 1
No
No
No
No
No
No
No
1771ĆASB
Series A
8
16
32
Yes
ĆĆ 1
No
Yes
Yes
ĆĆ 1
No
No
No
1771ĆASB
Series B, C, and D
8
16
32
Yes
ĆĆ 1
No
Yes
Yes
ĆĆ 1
Yes
Yes
Yes
1771ĆAM2 8
16
32
ĆĆ
ĆĆ
ĆĆ
Yes
Yes
ĆĆ 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