Allen-Bradley FLEX I/O 1794-IP4, User Manual, Page: 41 / 70

4–3 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Publication 1794-6.5.16 – September 1998
Block Transfer Read 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
0 Counter 00 – 16–bit period measurement or low word of 32-bit period measurement for channel 0
1 Counter 01 – pulse counter or high word of 32-bit period measurement for channel 0
2 Counter 10 – 16–bit period measurement or low word of 32-bit period measurement for channel 1
3 Counter 11 – pulse counter or high word of 32-bit period measurement for channel 1
4 Counter 20 – 16–bit period measurement or low word of 32-bit period measurement for channel 2
5 Counter 21 – pulse counter or high word of 32-bit period measurement for channel 2
6 Counter 30 – 16–bit period measurement or low word of 32-bit period measurement for channel 3
7 Counter 31 – pulse counter or high word of 32-bit period measurement for channel 3
8
Readback of Control Word 2
8
Reserved M3 M2 M1 M0
9 Revision read – software version code
Where: M = positive edge measurement ready for the respective channel.
Bit/Word Definitions for Block Transfer Read Words
for the
Pulse Counter Module
Read
Word
Bit Definition
0 Bits 00–15
(00–17)
Store Counter 00 – 16–bit period measurement or low word of 32-bit period measurement for channel 0.
1 Bits 00–15
(00–17)
Counter 01 – pulse counter or high word of 32-bit period measurement for channel 0
2 Bits 00–15
(00–17)
Counter 10 – 16–bit period measurement or low word of 32-bit period measurement for channel 1.
3 Bits 00–15
(00–17)
Counter 11 – pulse counter or high word of 32-bit period measurement for channel 1
4 Bits 00–15
(00–17)
Counter 20 – 16–bit period measurement or low word of 32-bit period measurement for channel 2.
5 Bits 00–15
(00–17)
Counter 21 – pulse counter or high word of 32-bit period measurement for channel 2
6 Bits 00–15
(00–17)
Counter 30 – 16–bit period measurement or low word of 32-bit period measurement for channel 3.
7 Bits 00–15
(00–17)
Counter 31 – pulse counter or high word of 32-bit period measurement for channel 3
Allen-Bradley HMIs