System Data Registers Relating To Logging/Trace Operation; Checking Logging Speed (When Selecting Logging For Application) - Panasonic FP7 User Manual

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3.2.3 System Data Registers Relating to Logging/Trace Operation

 System data registers (SD)
Device
Name
No.
SD100 Buffer free space
Buffer overflow
SD120
counter
(Note 1) The above device numbers are those for LOG0. System data register numbers vary depending on LOG
numbers as shown in the table below.
LOG
0 1 2
No.
100 101 102
SD
No.
120 121 122

3.2.4 Checking Logging Speed (When Selecting Logging For Application)

 When the logging speed to the buffer memory of the CPU unit is faster than the writing
speed into an SD memory card, the logging over-speed relay turns on. The logging over-
speed relay turns on at the timing of logging trigger, and turns off if the speed does not
exceed at the end of scan.
 If overspeed occurs frequently, the buffer memory will be full and data cannot be
accumulated.
 Once the buffer memory is full, the buffer overflow flag turns on, and the buffer overflow
counter is incremented (+1).
 If the buffer overflow occurs continuously, revise the logging conditions to decrease the
logging speed.
 To know how much logging data was lost at the time of buffer overflow, register the buffer
overflow counter as logging data.
 Even if the buffer overflow occurs, recording data into an SD memory card goes on, and
logging continues when free space becomes available in the buffer.
 The free space of buffer memory can be checked with the system data registers SD100 to
SD115.
 The system relays (SR104, SR114, SR124 ...) give a warning when the buffer memory is full.
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3-6
Operation
Stores free space of buffer memory during logging. This relay is always
zero when selecting Trace for the application.
Increments the value (+1) when the buffer overflow occurs. This is always
zero when selecting Trace for the application.
3 4 5 6
103 104 105 106
123 124 125 126
7 8 9 10
107 108 109 110
127 128 129 130
11 12 13 14
111 112 113 114
131 132 133 134
15
115
135