Rockwell Automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User Manual - Manual (Page 80)

2–60 How Communication Takes Place and I/O Image Table Mapping
Publication 1794ĆUM057B-EN-P - November 2001
PulseCounter Module(1794ĆIP4) ImageTableMapping
ModuleImage
I/O Image
Input Size
Output Size
0 to 3 Words
1 to 10 Words
Counter 00 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 0
Codefor identification of softwareversion
Control Word 0 - Se ts the me asurefunction
Control Word 2 - se ts the start of a new measurement
Control Word 1 - Se ts the clock frequency and period multiple
Counter 01 - pulse counter for channel 0 or high word of 32Ćbit period measurement
Counter 10 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 1
Counter 11 - pulse counter for channel 1 or high word of 32Ćbit period measurement
Counter 20 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 2
Counter 21 - pulse counter for channel 2 or high word of 32Ćbit period measurement
Counter 30 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 3
Counter 31 - pulse counter for channel 3 or high word of 32Ćbit period measurement
Readback of Control word 2 or
Reserved M0 M1 M2 M3
Reserved
Reserved
RD0 RD1 RD2 RD3
Block Transfer Word Assignments for the Pulse Counter Module
(1794-IP4)
(Octal Bit ⇒ ) 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Dec. Bit ⇒ 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Word ⇓ Read
1 Counter 00 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 0
2 Counter 01 - pulse counter or high word of 32Ćbit period measurement for channel 0
3 Counter 10 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 1
4 Counter 11 - pulse counter or high word of 32Ćbit period measurement for channel 1
5 Counter 20 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 2
6 Counter 21 - pulse counter or high word of 32Ćbit period measurement for channel 2
7 Counter 30 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 3
8 Counter 31 - pulse counter or high word of 32Ćbit period measurement for channel 3
9
Readbackof Control Word 2
9
Reserved RD3 RD2 RD1 RD0 M3 M2 M1 M0
10 Revision read - software version code