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7 PROFIBUS DP Communication
7.3 SIMATIC S7 project
611U conformant
mode
Step 1: End
7-228
In conjunction with SINUMERIK 840Di, the number of additional bits for fine
resolution should currently be set to the value 11. This corresponds to a pulse
11
multiplication of: 2
= 2048.
Transferred encoder actual value G1_XIST1
31
current encoder
Overflows
increments
Notice
S
Parameter "Additional substitute bits for fine resolution" must currently al-
ways be set to 11.
S
In accordance with the parameter "Additional substitute bits for fine resolu-
tion,
– MD30260: ABS_INC_RATIO (ratio of absolute resolution to incremental
resolution)
"Additional substitute bits for fine resolution"
the value: 2
tered in the machine data.
With parameter "611U conformant mode" is used for selection of the signal
source conformant with SIMODRIVE 611 universal for referencing the axis.
In 611U conformant mode, the signal source for referencing the axes (zero mark
or BERO) is no longer set in the standard message frame (encoder control word
G1_STW, page 7-226), but with the digital output word.
S
Digital output word, bits 8–11 (see O word, page 7-222)
Referencing the axis:
– Bit 8 = 0 –> axis 1 with zero mark of encoder 1 (X4–1)
– Bit 8 = 1 –> axis 1 with rising edge of BERO 1 (X6–2, Pin 2)
– Bit 9 = 0 –> axis 2 with zero mark of encoder 2 (X4–2)
– Bit 9 = 1 –> axis 2 with rising edge of BERO 2 (X6–2, Pin 3)
– Bit 10 = 0 –> axis 3 with zero mark of encoder 3 (X4–3)
– Bit 10 = 1 –> axis 3 with rising edge of BERO 3 (X6–2, Pin 4)
– Bit 11 = 0 –> axis 4 with zero mark of encoder 4 (X4–4)
– Bit 11 = 1 –> axis 4 with rising edge of BERO 4 (X6–2, Pin 5).
When you terminate the dialog box "DP slave properties" with the button: "OK",
the data are transferred and the dialog box is closed. Step 1 of parameterization
of DP slave 611U is then complete.
10
Reserved bits for fine resolution:
11
= 2
= 2048 must be en-
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03
0

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