Rockwell Automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters - Manual (Page 122)

Publication 1738-UM001A-EN-P - February 2005
D-12 Default Data Maps
1738-VHSC 24V dc High Speed Counter Module
Message size: 6 Bytes
1738-SSI Synchronous Serial Interface Absolute
Encoder Module
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Produces (scanner Rx) Channel 0 value of present counter state (LSW)
Channel 0 value of present counter state (MSW)
PE EF NR 0 FS FS OS OS 0 ZS BS AS C1 C0 ZD 0
Where: PE = Programming error
EF = EEPROM fault status
NR = Not ready status bit
FS = Output fault status bit - bit 10 for output 0, bit 11 for output 1
OS = Output on/off status bit - bit 8 for output 0, bit 9 for output 1
ZS = Z input status
BS = B input status
AS = A input status
C = Stored data count
ZD = Zero frequency detected
LSW = Least significant word
MSW = Most significant word
7 6 5 4 3 2 1 0
Produce 8 C2ST C1ST C2R C1R INC DEC RUN I1 Status Byte 0 1
Produce 9 RES RES RES LHON IDF 2 CCE CCF SPF Status Byte 1 1
1. For detailed descriptions of these bits, see 1738-SSI User Manual, publication 1738-UM009.
2. Monitor IDF to determine the validity of the produced data. If IDF=1, the SSI data is false.
7 6 5 4 3 2 1 0
Consume 0 RES RES RES SCMP2 SCMP1 CC2 CC1 LACK Master ACK
Byte
1, 3
Consume 1 RES RES RES RES RES RES RES RES CONS1 1
3. The master must provide the Master ACK Byte in order to receive the polled Produced bytes 0-9.