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S5-100U
•
Diagnostic Byte (Byte 1)
The diagnostic byte is byte 1 of the first input word. Byte 0 has no significance.
The diagnostic byte provides information on the following items:
- Preset position resolution
- Preset mode
- Status of setpoints
- Signal status of the sync bit for position decoding
Position resolution
Mode
Position decoding
Counter overflow
No counter overflow
Setpoint 2 reached
Setpoint 2 not reached
Setpoint 1 reached
Setpoint 1 not reached
Sync bit not set *
X = irrelevant
*
If the sync bit is not set, a reference point approach must be implemented before operation
can continue in the Position Decoding mode.
15-26
Bit No.:
7
6
X
R
0
single
1
double
1
quadruple
0
not possible
1
Counter
0
1
0
1
0
1
0
Sync bit set
1
0
Figure 15-15. Diagnostic Byte
5
4
3
2
R
P/C OV
S
S
2
1
0
1
0
Function Modules
1
0
Sy
1
EWA 4NEB 812 6120-02
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