Siemens SINAMICS G110D Operating Instructions Manual page 148

Functions
6.11 Operation in fieldbus systems
Table 6- 55 Default output process image (master to slave)
Bit Usage
Slave 2
DO0 Motor control bit 0
DO1 Motor control bit 1
DO2 Motor control bit 2
DO3 A / B select
Slave 1
DO0 Serial clock out
DO1 Serial data out
DO2 Quickstop override
DO3 A / B select
(1) The AS-i specification mandates the simultaneous use of 'Motor Left' and 'Motor Right' as fault acknowledge,
particularly if there is no spare input available for this function.
(2) If no fault is active then simultaneous operation of 'Motor Left' and 'Motor Right' constitutes a process image error. In
this state both the inverter motor outputs and the motor holding brake outputs are inactive, causing the motor to coast to a
halt and engaging the motor holding brake in exactly the same way as an OFF2 command. This state is maintained until
both 'Motor Left' and 'Motor Right' are deactivated at the same time.
PKW mechanism for parameter transfer
A single message type is used which contains the parameter number to be read or written.
The structure of the message is based on the PKW protocol as used in USS
communications.
Structure
The basic structure of the PKW is shown in the figure below. it consists of two words of
metadata followed by parameter data s required. As required by AS-i, all transfers are
initiated by the AS-i master and where appropriate, responded to by the slave.
Figure 6-33
The PKE consists of two fields. Bits 12 - 15 contain the request identifier (AK) as shown in
the tables below. In this structure, parameter numbers are paged. Bits 10 - 0 of the PKE
comprise the parameter number within a page of 2000 parameters; the page is defined in
bits 10 - 15 of the IND word as shown in the figure below.
148
Description
DO2 DO1 DO0
0 0 0 OFF1
0 0 1 Fixed frequency 1 (default 50 Hz)
0 1 0 Fixed frequency 2 (default -50 Hz)
0 1 1 Fixed frequency 3
1 0 0 Fixed frequency 4
1 0 1 Fixed frequency 5
1 1 0 Fixed frequency 6 with active trip: fault ack (1)
1 1 1 With no trip: OFF2 (2)
0: 'A' slave active
1: 'B' slave active
Clock signal for CTT2 data transfer from AS-i master
Data signal for CTT2 data transfer from AS-i master
0: Quick stop active
1: Quick stop override: allow Inverter to ignore quick stop
0: 'A' slave active
1: 'B' slave active
PKW component structure
Operating Instructions, 2009-05-15, A5E02385577A AB
SINAMICS G110D