
with PLC Controllers
Chapter 4
Configuring the Bulletin 2705 Keypad Module
4–7
The 2705 Keypad Module can be configured for any of four rack sizes:
1
/
4
,
1
/
2
,
3
/
4
, and a full rack. Rack sizes relate to the amount of I/O accessible to
each rack: 32 I/O bits or points for
1
/
4
rack, 64 for
1
/
2
rack, 96 for
3
/
4
rack
and 128 for a full rack. You set DIP switches for the rack size you want in
your system design. See Chapter 5 on DIP switch settings.
IMPORTANT NOTE: For stored messages, you must configure for
1
/
2
rack or larger. You cannot use stored messages with
1
/
4
rack.
Note: Stored message display requires
3
/
4
rack to use the BCD mode. BCD
mode can only be configured for
1
/
4
or
1
/
2
rack if message storage is
disabled.
Table 4.D shows the functional characteristics of the Keypad Module
configured in the available rack sizes:
Table 4.D
2705 Keypad Module Functions by Rack Size
BCD Mode
Binary or
Integer Mode
(8 Digits)
Rack Size
tore
essage
Capability
Number of BCD
Digits
Number of
ASCII
Characters from
PLC
Number of
ASCII
Characters from
PLC
um
er o
Destination Bits
1
/
4
Rack No 6 0 0 0
1
/
2
Rack
BCD=N
Other=Yes
8 2 4 16
3
/
4
Rack Yes 8 8 8
BCD=32
Others=48
Full Rack Yes 8 10 12
BCD=64
Others=80
Calculating Rack Size
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