Mitsubishi Electric M800VW Series Manual page 129

M800V/M80V Series PLC Development Manual
5 Peripheral Development Environment (GX Works2)
5.5 Common Items
[Size required for one trace of each device]
Trace device type
Word device
Bit device
The size of trace data can be calculated from the following equation.
[Trace data size (byte)]
= (([number of bit device units] + [number of word devices]) × [2 (byte)] + [4 (byte) (*)]) × [trace count]
(*) Only when time information is added
Calculation example for trace data size is shown below.
Trace data size calculation examples (when three projects are valid)
No. Bit device points
1 16 (1 unit)
2 8 (1 unit)
3 50 (4 unit)
4 50 (4 unit)
(*2) Applicable devices with trace/trigger point details setting
Bit device: X, Y, M, L, F, SB, B, SM, T(contact), ST(contact), C(contact)
Word device: T(current value), ST(current value), C(current value), D, R, SW, SD, W,ZR
Following qualifications are available for the above devices.
 Bit device digit designation
 Word device bit designation
When any inapplicable device is set for [Device], an error occurs when the trace setting file to execute trace is read.
(*3) Applicable devices with device setting
Bit device: X, Y, M, L, F, SB, B, SM, T(contact), T(coil), ST(contact), ST(coil), C(contact), C(coil)
Word device: T(current value), ST(current value), C(current value), D, R, SW, SD, W,ZR
Following qualifications are available for the above devices.
 Bit device digit designation
 Word device bit designation
Process following an inapplicable device setting is as follows.
 If one or more applicable devices already exist, the setting of the inapplicable device will be ignored.
 If no applicable devices exist, an error occurs at trace execution.
IB-1501614-B
Size (byte) required for one trace
2 bytes per point
2 bytes per unit (1 unit = 16 points)
1 to 16 points -> 1 unit -> 2 bytes
17 to 32 points -> 2 units -> 4 bytes
33 to 48 points -> 3 units -> 6 bytes
49 to 50 points -> 4 units -> 8 bytes
Word device points Trace count
2 8192
8 1000
50 606
50 607
Applicable device
Applicable device
Trace data size
((1 + 2) x 2) x 8192 = 49152 bytes
((1 + 8) x 2) x 1000 = 18000 bytes
((4 + 50) x 2) x 606 = 65448 bytes
((4 + 50) x 2) x 607 = 65556 bytes
104
Sampling
Possible
Possible
Possible
Not possible