Read data from the cfm module, Btr word descriptions – Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET User Manual
Page 73
Replace Your QRC Module
C–9
Publication 1771Ć6.5.99 - December 1995
Read Data From the CFM Module
When configured for QRC module emulation, BTR programming
moves three words from the CFM module to the PLC processor’s
data table. The following BTR assignments apply when the CFM
module is configured for QRC module emulation.
BTR
Bit
BTR
Word
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Block ID
ЙЙЙ
1
ЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙЙ
Header
Input Channel Rate
2
Rate of Ratemeter A
3
Rate of Ratemeter B
*ALL numeric values are in binary*
BTR Word Descriptions
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Header will be 7001 Hex or 28,673 binary. Identifies the
module as a CFM (QRC) module.
word 1
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Rate Ċ indicates the calculated rate.
RANGE: 0Ć15,800Hz binary
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
word 2 (ratemeter A)
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
1
The rates in words 2 & 3 are updated every 13.5msĆ20ms
maximum. The greater the frequency, the faster the
update time. The accuracy of the returned rate is
±
1Hz.
Rates: 0Ć169Hz are reported as zero
170Ć15,800Hz are reported as calculated
> 15,800Hz are reported as 15,800
word 3 (ratemeter B)