5–5
How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter
Publication 1794-6.5.16 – September 1998
Definition
Bit
Word
Read
Word 6
Bits 00–15
(00–17)
Counter 21 – pulse counter or high word of 32-bit period measurement for channel 2
Read
Word 7
Bits 00–15
(00–17)
Counter 30 – 16–bit period measurement or low word of 32-bit period measurement for channel 3.
Read
Word 8
Bits 00–15
(00–17)
Counter 31 – pulse counter or high word of 32-bit period measurement for channel 3
Read
Wor 9
Bit 00
Positive edge – Channel 0 – measurement ready
Word 9
Bit 01
Positive edge – Channel 1 – measurement ready
Bit 02
Positive edge – Channel 2 – measurement ready
Bit 03
Positive edge – Channel 3 – measurement ready
Bit 04–15
Reserved for factory use
Read
Word 10
Bits 00–15
(00–17)
Software revision – version code of software installed
Write
Wor 1
Control Word 0 – Control word for setting the function of counter 0.
Word 1
Bits 00
Pulse counting and period time measurement selection for Channel 0 –
0 = pulse counting and period time measurement selected
1 = period time measurement selected
Bits 01
Pulse counting and period time measurement selection for Channel 1 –
0 = pulse counting and period time measurement selected
1 = period time measurement selected
Bits 02
Pulse counting and period time measurement selection for Channel 2 –
0 = pulse counting and period time measurement selected
1 = period time measurement selected
Bits 03
Pulse counting and period time measurement selection for Channel 3 –
0 = pulse counting and period time measurement selected
1 = period time measurement selected
Bits 04–15
(04–17)
Reserved
Write
Word 2
Bit 00
Clock frequency for period time measurement – Channel 0 –
0 = period time measurement with 10MHz internal clock selected
1 = period time measurement with 1MHz internal clock selected
Bits 01–03
03
02
01
Number of periods for measurement – Channel 0
0
0
0
1 period
0
0
1
2 periods
0
1
0
4 periods
0
1
1
8 periods
1
0
0
16 periods
1
0
1
32 periods
1
1
0
64 periods
1
1
1
128 periods
Allen-Bradley HMIs