Siemens SINAMICS S Series - Figure 2-146 4720 - Encoder interface, receive signals, encoders 1... 3

Encoder evaluation
Function Diagrams
2-1263
© Siemens AG 2007 All Rights Reserved SINAMICS S List Manual (LH1), 07/2007
Figure 2-146 4720 – Encoder interface, receive signals, encoders 1 ... 3
- 4720 -
Function diagram
87654321
fp_4720_01_eng.vsd
DO: SERVO, VECTOR
SINAMICS S
16.03.07 V02.05.00
Encoder evaluation - Encoder interface, receive signals, encoders 1 ... 3
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
(0)0
p0480[n-1]
Selects the function to be activated (with bit value = 1)
Start/stop/read selected function
0
r0487[n-1]
Enc Gn_STW
Index [n-1] --> encoder n
Index [0] --> encoder 1
Index [1] --> encoder 2
Index [2] --> encoder 3
The position actual values are read out of Gn.XIST2 using a
handshake technique. The following example of a pulse diagram
shows how the position is read in at reference mark 1 (Mode: Bit 7 = 0)
Select function 1 [Bit 3...0]
("search for reference mark 1")
Start function [Bit 6...4]
Function active [Gn_ZSW Bit 0]
Actual value save at the
reference mark
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
000 000
001
000 010
0001
1 0 1
0 0
0 0
1
00
0
1
2
3 4
3
2
1
Function No.
Bit No.
Function for bit 7 = 0
(search for reference mark)
Function for bit 7 = 1
(flying measurement)
Reference mark 1 Measuring probe 1
Reference mark 2 Measuring probe 1
Reference mark 3 Measuring probe 2
Reference mark 4 Measuring probe 2
<1>
<2>
Control word for encoder n (n = 1, 2 or 3)
5
7
8...12
13
14
15
Mode of the function to be activated
1 = flying measurement
0 = Search for reference mark (zero mark or BERO)
Reserved part
1 = Request cyclic transfer of the absolute position value in
Gn_XIST2
(e.g. EQN absolute track; acknowledgment in Gn_ZSW bit 13)
1 = Request parking encoder (handshake with Gn_ZSW bit 14)
= acknowledge encoder fault (located in Gn_ZSW, bit 15;
Handshake with Gn_ZSW bit 11)
1
<3> 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.
<3>
To the position sensing, encoder n
[4704.3]
6
<4>
The checkback signal is provided in Gn_ZSW bit 14, but the encoder is not
actually parked.
<4>
<1>
<1>
PROFIdrive bit
Interrupt function
Read generated value
Activate selected function
No function
4
Refer to [1020.7]
PROFIdrive sampling time
If the "position module" function module (r0108.3 = 1) is activated, the
interconnection is established via r2520[0]...[2] from [4010.8].
If a standard telegram (PROFIdrive) is selected, the interconnection is performed
according to the specifications of the standard telegrams [2420].
<5>
<5>