Calculating rack size – Rockwell Automation 2705 REDIPANEL KEYPAD MODULE USER MANUAL User Manual
Page 24
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
Stored Message
BCD Mode
Binary or
Integer Mode
(8 Digits)
N mber of
Rack Size
Stored Message
Capability
Number of BCD
Digits
Number of
ASCII
Characters from
PLC
Number of
ASCII
Characters from
PLC
Number of
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