AB Quality ALLEN-BRADLEY 1791 User Manual page 57

Chapter 7
Module Calibration
Word/ Octal Bit
Word/Decimal Bit
0
1
2
3
4
7-2
Table 7.B
Calibration Block Transfer Write or Discrete Output Bit/Word Descriptions
Decimal Bit
Word
(Octal Bit)
Bit 00
Bit 01
Bit 02
Bit 03
Bit 04
Bit 05
Bit 06
Word 0
Bit 07
Bit 08 (10)
Bits 9 10 (11 12)
Bit 11 (13)
Bits 12 15 (14 17)
Word 1 Bits 00 15 (00 17)
Word 2 Bits 00 15 (00 17)
Table 7.C
Calibration Block Transfer Read Data File
17 16 15 14 13
15 14 13 12 11
1 1 0 0 OK
Description
Input select bit. Indicates input channel 0 being calibrated.
Input select bit. Indicates input channel 1 being calibrated.
Input select bit. Indicates input channel 2 being calibrated.
Input select bit. Indicates input channel 3 being calibrated.
Output select bit. Indicates output channel 0 being calibrated.
Output select bit. Indicates output channel 1 being calibrated.
High/low bit HL. Indicates whether full scale or zero data point is being
updated:
Bit 06 = 1 - full scale
Bit 06 = 0 - zero data point
Execute Bit. EX. When set (1), starts calibration and updates the
selected channels.
Input Mode Bit IM.
Bit 08 (10) = 0 - Use for voltage inputs. Input scaling in mV
Bit 08 (10) = 1 - Use for current inputs. Input scaling in µA
Not used
EEPROM write bit OK. When set (1), requests the current calibration
data be saved.
Calibration mode bits. Set to 1100 to select a calibration sequence.
Output Channel 0 Calibration Data - user entered calibration data
when EX = 0 (bit 07 in word 0), scaled and corrected output data when
DN bit (bit 07 in BTR) = 1.
Output Channel 1 Calibration Data - user entered calibration data
when EX = 0 (bit 07 in word 0), scaled and corrected output data when
DN bit (bit 07 in BTR) = 1.
12 11 10 07 06
10 09 08 07 06
IM DN HL
Corrected Input Channel 0 Data
Corrected Input Channel 1 Data
Corrected Input Channel 2 Data
Corrected Input Channel 3 Data
05 04 03 02 01
05 04 03 02 01
O1 O0 I3 I2 I1
00
00
I0