Siemens SINUMERIK 840Di Manual page 226

7 PROFIBUS DP Communication
7.3 SIMATIC S7 project
Encoder control
word
G1_STW
Bit Name
0
1
Func- Func-
tions
Reference
mark
search
2
or
In-process
measure- measure-
ment.
3
4
Com-
5
mand mand
6
7 7 Mode Mode
7-226
Description of the encoder control word (extract) with regard to:
S
Reference mark search
S
In-process measurement.
Bit 7 = 0 => Request: Reference mark search
Bit Meaning
0 Function 1: Referencing using a zero mark
(except for "611U conformant mode")
1 Function 2: Referencing using a rising edge of the associated BERO
2 Function 3: Referencing using a falling edge of the associated BERO
3 3 Function 4: not used Function 4: not used
Bit 7 = 1 => Request: In-process measurement.
Bit Meaning
0 Function 1: Sensor 1 rising edge
1 Function 2: Sensor 1 falling edge
2 Function 3: Sensor 2 rising edge
3 Function 4: Sensor 2 falling edge
Tip:
S
Bit x = 1 Function requested
Bit x = 0 Function not requested
S
If more than one function is activated, then:
The values for all functions can only be read when each activated function has
been terminated and this has been confirmed with the corresponding status bit been terminated and this has been confirmed with the corresponding status bit
(G1_ZS Bit0 / 3 "0" signal again).
S
In-process measurement.
A rising and falling edge can be activated simultaneously.
The sensor signal is detected depending on the direction. The values are read out
one after the other.
Bit 6, 5, 4 Meaning
000 000 Basic setting Basic setting
001 Activate function x
010 010 Read value x Read value x
011 Cancel function x
0 Reference mark search (zero mark or BERO)
1 In-process measurement.
Signal state, description
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03