Rockwell Automation 1734-SSI POINT I/O Synchronous Serial Interface Absolute Encoder Module User Manual - Manual (Page 24)

Publication 1734-UM007D-EN-P - December 2005
3-2 Communicate with Your Module
Byte Bit Description
Produce 8 7 6 5 4 3 2 1 0 Status Byte 0
C2ST C1ST C2R C1R INC DEC RUN I1
Produce 9 7 6 5 4 3 2 1 0 Status Byte 1 1
RES RES RES LHON IDF 2 CCE CCF SPF
1 Monitor IDF to determine the validity of the produced data. If IDF=1, the SSI data is false.
Byte Bit Description
Consume 0 7 6 5 4 3 2 1 0 Master ACK
Byte
2
RES RES RES SCMP2 SCMP1 CC2 CC1 LACK
Consume 1 7 6 5 4 3 2 1 0 CONS1
RES RES RES RES RES RES RES RES
2 The master must provide the Master ACK Byte in order to receive the polled Produced bytes 0…9.
I1 = Input 1 Status (1 = Input 1 ON, 0 = OFF)
RUN = SSI Clock Output Status (1 = Clock Output ON, 0 = OFF)
DEC = SSI Data Count Decreasing (1 = Decreasing, 0 = Not Decreasing)
INC = SSI Data Count Increasing (1 = Increasing, 0 = Not Increasing)
C1R = Comparator 1 Value Reached (1 = Value Reached, 0 = Not Reached)
C2R = Comparator 2 Value Reached (1 = Value Reached, 0 = Not Reached)
C1ST = Comparator 1 Active (1 = Active, 0 = Not Active)
C2ST = Comparator 2 Active (1 = Active, 0 = Not Active)
SPF = SSI Sensor Power Fault (1 = Fault Present, 0 = No Fault)
CCF = Coprocessor Configuration Fault (1 = Fault Present, 0 = No Fault)
CCE = Coprocessor Communication Error (1 = Error Present, 0 = No Error)
IDF = SSI Input Data Fault (1 = Fault Present, 0 = No Fault)
LACK = Input 1 Latch Acknowledge (1 = Unlatch, 0 = No Fault)
CC1 = Clear Comparator 1 (1 = Clear)
CC2 = Clear Comparator 2 (1 = Clear)
SCMP1 = Set Comparator 1 (1 = Comparator 1 is Active)
SCMP2 = Set Comparator 2 (1 = Comparator 2 is Active)
RES = Reserved (Bit = 0)
LHON = Latched Data is Stored (1 = Latched Data Present, 0 = Latched Data Not Present)