Rio Communication Retry Counter (M1:E.16 47); Retry Counter Example For Primary Devices - Allen-Bradley 1747-SN User Manual

RIO Communication Retry
Counter (M1:e.16 47)
G File - Primary
Bit Number
Primary Logical Device Address, Word 1
G File - Complementary
Bit Number
Complementary Logical Device Address,
Word 3
M1 File Status Words 16 through 47 – indicate how many RIO
communication retries the scanner makes to each adapter on the RIO
link if communication problems occur. Each word (16–47) contains
a retry counter for each configured quarter logical rack (words 16–31
are for primary logical racks, 0–3, and 32–47 are for complementary
racks, 8–11). Retry counters are useful for troubleshooting
communication problems (such as electrical noise or poor
communication line connections) between the scanner and any
adapters. The scanner clears the retry counters when going from
Program to Run mode, Test to Run mode, and when going from
Program to Test mode. Note that the display (in words M1:e.16 –31)
of retry counters corresponds to the bits set in the Primary Logical
Device Address – Word 1 of the G file. Likewise, the display (in
words M1:e.32–47) correspond to the bits set in the Complementary
Logical Device Address – Word 3 of the G file.
Important:

Retry Counter Example for Primary Devices

The scanner's I/O image tables are configured as shown with M1
status files displaying the corresponding retry counters:
15 14 13 12 11 10
RIO Logical Rack 3 RIO Logical Rack 2
Starting Group Starting Group
6 4 2 0 6 4
1 0 0 1 0 0
É É É Ç Ç
15 14 13 12 11 10
RIO Logical Rack 11 RIO Logical Rack 10
Starting Group Starting Group
6 4 2 0 6 4
É É É Ç Ç
0 0 1 1 0 0
É É É Ç Ç
M1:e.16 – communication retry counter for RIO logical rack 0, group 0
M1:e.17 – not used in this example
M1:e.18 –communication retry counter for RIO logical rack 0, group 4
M1:e.19 – not used in this example
Scanner Configuration and Programming
Your SLC control program cannot initialize/clear retry
counters.
9 8 7 6 5 4
RIO Logical Rack 1
Starting Group
2 0 6 4 2 0
1 0 0 0 0 1
É É Ç Ç
9 8 7 6 5 4
RIO Logical Rack 9
Starting Group
2 0 6 4 2 0
É É Ç Ç
0 1 0 0 0 1
É É Ç Ç
3 2 1 0
RIO Logical Rack 0
Starting Group
6 4 2 0
Specifies RIO
0 1 0 1
É É
addresses for
primary logical
devices.
3 2 1 0
RIO Logical Rack 8
Starting Group
6 4 2 0
É É
Specifies RIO
0 0 0 1
addresses for
É É
complementary
devices.
Publication 1747 6.6 - July 1996
4–29