Справочник Пользователя для Allen-Bradley devicenet modules in logix5000 control systems
Publication DNET-UM004A-EN-P - March 2004
15-30 Using POINT™ I/O Modules on a DeviceNet Network
1734-VHSC 5V dc High Speed Counter Module
Message size: 6 Bytes
1734-SSI Synchronous Serial Interface Absolute
Encoder Module
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 1734-SSI User Manual, publication 1734-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
Byte
1
Consume 1
RES
RES
RES
RES
RES
RES
RES
RES
CONS1
3.
The master must provide the Master ACK Byte in order to receive the polled Produced bytes 0-9.