Siemens SINAMICS S120 Installation And Start-Up Manual page 116

Communication via PROFIBUS
Cyclic communication
Encoder 2 control word (G2_CTW)
S see G1_CTW (Table 4-13)
Encoder 3 control word (G3_CTW)
S see G1_CTW (Table 4-13)
Encoder 1 status word (G1_STW)
The encoder status word is used to display states, errors and acknowledgements.
Table 4-14 Description of the individual signals in Gx_STW
Bit Name
0
Status:
1
Function Function
1 – 4
2
active
3
Find refer-
ence
4
marker
or or
Measure-
ment on-
5
Status:
the-fly
Value Value
1 – 4
available
6
7
Probe 1 Probe 1
8 8
deflected
Probe 2 Probe 2
9 9
deflected
10 Reserved
4-116
Signal state, description
Valid for find reference marker and measurement on-the-fly
Bit Meaning
0 0 Function 1 Function 1
1 Function 2
2 Function 3
3 Function 4
Note: Note:
S
Bit x = 1 Function active
Bit x = 0 Function inactive
Valid for find reference marker and measurement on-the-fly
Bit Meaning
4 Value 1 Reference marker 1
Probe 1 positive edge Probe 1 positive edge
5 Value 2 Probe 1 negative edge
6 Value 3 Probe 2 positive edge
7 Value 4 Probe 2 negative edge
Note:
S
Bit x = 1 Value available
Bit x = 0 Value not available
S
Only one value can be fetched at a time. y
Reason: only one shared status word Gx_XACT2 is available for
reading the values.
S
The probe must be configured to a "high-speed input" DI/DO on the
Control Unit.
1 Probe deflected (high signal)
0 Probe not deflected (low signal)
1 Probe deflected (high signal)
0 Probe not deflected (low signal)
-
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Reference marker 1 Reference marker 1
Probe 1 positive edge
Probe 1 negative edge
Probe 2 positive edge
Probe 2 negative edge
E Siemens AG, 2004. All rights reserved