Installation manual

Publication 1747-RM001G-EN-P - November 2008
12-20 SLC Communication Instructions
Here are two examples of Read Register commands.
Note the format differences between Float File and Integer File.
– If the destination is Floating File (Example 1), word-swap may be
necessary.
– If the destination is Integer File (Example 2), word-swap may not be
necessary.
Here, it is assumed the peer device has not already swapped the word
order in the reply. You need to validate the word order by checking the
received value in RSLogix 500, prior to implementation on the network.
Here are two examples of Write Register commands.
Example 1: A 32-bit Read Request for an Integer (N) command
RSLogix 500 Data View (dec) SLC Processor
(hex)
MLX Processor
(hex)
RSLogix 500 Data View (dec)
Example 2: A 32-bit Read Request for an Float (F) command
RSLogix 500 Data View (dec) SLC Processor
(hex)
MLX Processor
(hex)
RSLogix 500 Data View (dec)
8192 18417
18417 8192
error
2000 47F1
47F1 2000
Read no swap
R
e
a
d
w
o
r
d
-
s
w
a
p
2000 47F1
8192 18417
1.086583e-19
123456
error
2000 47F1
47F1 2000
Read no swap
R
e
a
d
w
o
r
d
-
s
w
a
p
2000 47F1
123456
Example 3: A 32-bit Write Request for an Integer (N) command
RSLogix 500 Data View (dec) SLC Processor
(hex)
MLX Processor
(hex)
RSLogix 500 Data View (dec)
8192 18417
2000 47F1
Write no swap
W
r
i
t
e
w
o
r
d
-
s
w
a
p
2000 47F1
47F1 2000
8192 18417
18417 8192
error