Siemens SINAMICS G120 List Manual page 883

PROFIdrive-Bit
<1> <5>
Enc Gn_STW S_src
p0480 [n-1]
Control word for encoder n (n = 1 or 2)
Bit
(0)
Selects the function to be activated (with bit value = 1)
Function for bit 7 = 0
Function
(search for reference
no.
mark)
Reference mark
0 1
1 2 Reference mark
2 3 Reference mark
3 4 Reference mark
Start/stop/read selected function
4
0 1 0
5 0 0 1
6 0 0 0
Mode of the function to be activated
7 1 = flying measurement
0 = Search for reference mark (zero mark or BERO)
Reserved
8...12
1 = Request cyclic transfer of the absolute position value in
13 Gn_XIST2
(e.g. EQN absolute track; acknowledgment in Gn_ZSW bit 13)
14 1 = Request parking encoder (handshake with Gn_ZSW bit 14)
= acknowledge encoder fault (located in Gn_ZSW, bit 15;
15
Handshake with Gn_ZSW bit 11)
<3>
1 2
Encoder evaluation
Encoder interface, receive signals, encoders 1 ... 2
Function for bit 7 = 1
(flying measurement)
Measuring probe 1
1
2 Measuring probe 2
3 Measuring probe 3
4 Measuring probe 4
1
1
0
Interrupt function
Id controller
Activate selected function
No function
<4>
3 4
<1>
To the position sensing,
Geb Gn_STW
encoder n [4704.3]
r0487[n-1]
To Reference mark search
with equivalent zero mark,
<1>
encoder 1 [4735.3]
<2>
Bits 0...13 control what is transferred in
Gn_XIST 2.
There are 3 alternatives:
- Bit 7 = 0: Position actual value at the reference
mark <2>
- Bit 7 = 1: Position actual value when the
measuring probe edge is received <2>
- Bit 13 = 1:Cyclic absolute position value from
absolute encoder
<3>
<4>
<5>
5
fp_4720_97_55.vsd
05.09.2017
Index [n-1] --> encoder n
Index [0] --> encoder 1
Index [1] --> encoder 2
Actual position values are read out from Gn.XIST2 using a handshake
procedure. e.g.: Read position value(s) at reference mark(s)
1. Set r0487.[0...3] according to the function to be activated.
2. Set r0487.4 (activate function)
3. Reset all bits from r0487.[0...4] to 0.
4. r0481[0...3] must be active depending on the activated function.
5. Overtravel zero mark(s) until all bits in r0481.[0...3] are reset to 0.
6. Select r0487.[0...3] individually and activate with r0487.5 until r0481.[4...7]
is equal to 1 and read out the position values in r0483.
7. Reset all bits, starting with r0487.5 followed by r0487.[0...3].
The following pulse diagram is an example for reading in the position at the
reference mark 1 (mode: bit 7 = 0).
Select function 1 [Bit 3...0]
0001
("search for reference mark 1")
000 001
Start function [Bit 6...4]
Function active [Gn_ZSW Bit 0]
Actual value save at the
reference mark
000
Read generated value [Bit 6...4]
Value from function 1 available
[Gn_ZSW Bit 4]
Position actual value at
reference
mark 1 in Gn_XIST2
Further reference marks can be read out according to PROFIdrive profile.
The bits are processed with the following priority sequence (highest
priority --> lowest priority bit): Bit 14 --> Bit 15 --> Bit 4...7 --> Bit 12 -->
Bit 13.
The checkback signal is provided in Gn_ZSW bit 14, but the encoder is
not actually parked.
If the "position module" function module is activated, the
interconnection is established via r2520[0]...[1] from [4010.8].
If a standard telegram (PROFIdrive) is selected, the interconnection is
performed according to the specifications of the standard telegrams
[2420].
6 7
Function diagram
G120 CU250S-2
V4.7.9
000
010
8
- 4720 -