SST-PFB-SLC User’s Guide
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12.1.2 Monitoring Bit Addresses
M0 and M1 Bit Monitoring Disabled
When monitoring a ladder program in run or test mode, the following bit
instructions, addressed to an M0 or M1 file, are indicated as false regardless
of their actual true/false logical state.
--| |-- --|/|-- --( )-- --(L)-- --(U)--
M0 and M1 Bit Monitoring Disabled
The SLC 5/03 and SLC 5/04 processors allow you to monitor the actual state
of each addressed M0/M1 address (or data table). The highlighting appears
normal when compared with the other processor data files. The SLC 5/03’s
performance will be degraded to the degree of M0/M1 referenced screen data.
For example, if your screen has 69 M0/M1 elements, degradation will be
significant.
If you need to show the state of the M0 or M1 addressed bit, transfer the state
to an internal processor bit.
12.1.3 Transferring Data between Processor Files and
M0/M1 Files
The SLC processor does not contain an image of the M0 or M1 file. As a
result, you must edit and monitor M0 and M1 file data via instructions in your
ladder program. For example, you can copy a block of data from a processor
data file to an M0 or M1 data file or vice versa using the COP instruction in
your ladder program. Refer to Chapter 6 of this manual for more detailed
information.
Access Time
During the program scan, the SLC processor must access the scanner card to
read or write M0 or M1 data. This access time must be added to the execution
time of each instruction referencing M0 or M1 data. The SLC 500 Instruction
Set Reference Manual contains details about this access time.
Minimizing the SLC Scan Time
Keep the SLC processor scan time at a minimum by minimizing the use of
instructions that address M0 or M1 files. You can further reduce their impact
by making such rungs true only periodically.
Refer to Chapter 6 of this manual for more detailed information.
Summary of Contents for SST-PFB-SLC
Page 7: ...Contents vii Technical Data 105 Index 107 A...
Page 8: ...SST PFB SLC User s Guide viii...
Page 14: ...SST PFB SLC User s Guide 6...
Page 20: ...SST PFB SLC User s Guide 12...
Page 34: ...SST PFB SLC User s Guide 26...
Page 53: ...45 6 DP Master Application Examples...
Page 56: ...SST PFB SLC User s Guide 48 Sample Program...
Page 57: ...DP Master Application Examples 49 Sample continued...
Page 66: ...Using the Scanner Module as a DP Slave 58...
Page 67: ...59 8 Using FDL...
Page 75: ...Using FDL 67 Sample Program...
Page 76: ...SST PFB SLC User s Guide 68 Sample Continued...
Page 80: ...SST PFB SLC User s Guide 72 Sample Program...
Page 81: ...SST PFB SLC User s Guide 73 Sample Continued...
Page 85: ...SST PFB SLC User s Guide 77...
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Page 87: ...79 9 Diagnostics This chapter describes system diagnostics...
Page 105: ...97 11 Network Parameter Defaults This chapter describes network defaults...