Siemens LOGO! CMR2040 Operating Instructions Manual page 119

Note
Evaluate application on the BM: "state" and "count"
To ensure data consistency, the BM application needs to evaluate the "state" and "count"
bytes:
1. If "state" = "invalid": Data is currently being written by the CMR.
Access is possible only if "state" = "valid" is set.
2. If "state" = "valid": Next, you read the Write Counter and store the value read in.
3. After you have completely read the data structure, check whether or not the
Write Counter has changed its value.
– If the value has not changed, you can continue to use the data structure.
– If the value has changed, repeat the read cycle and start at "1.".
Byte number
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
LOGO! CMR2020, LOGO! CMR2040
Operating Instructions, 10/2016, C79000-G8976-C356-03
Parameter Meaning
latNS North / South (N/S)
latD Degrees (0 ... 179)
latM Minutes (0 ... 59)
latS Seconds (0 ... 59)
latSF Seconds Fraction (0 ... 99)
lngEW East / West (E/W)
lngD Degrees (0 ... 179)
lngM Minutes (0 ... 59)
lngS Seconds (0 ... 59)
lngSF Seconds Fraction (0 ... 99)
alt Altitude meters (-32767 ... +32767)
satNum Number of satellites in use
state GPS signal state (0,1,2)
0: invalid
•
"invalid = 0" is set by the CMR during a write procedure.
1: current position
•
2: not current position
•
count Write Counter: This is incremented each time the GPS data is written by
the CMR.
res1 reserved for later use
Configuration (WBM)
5.13 Monitoring
119