Rockwell Automation 1791-XXXX ANALOG BLOCK I/O - Manual (Page 49)

Analog Block Applications Using
Discrete Transfers
Chapter 5
5-3
Table 5.B
Bit/Word Descriptions for Discrete Data Transfer - Output Table 1/2 Rack
Word
Decimal Bit
(Octal Bit)
Description
Output Enable Bit OE
Bit 15 (17)
Bit 15 (17)
Bit 15 (17)
0 Outputs are held at 0.
Note: To calibrate, you must set the Output
1 Both outputs are enabled.
Note: To calibrate, you must set the Output
Enable Bit to 1 (refer to Chapter 7).
Module Mode. Bits 12 thru 14 determine the operation of the block module.
Bits 12 14
14 (16) 13 (15) 12 (14)
Bits 12-14
(14-16)
0 0 0 Normal operation with voltage inputs
(14-16)
0 0 1 Normal operation with current inputs
1 0 0 Calibration operation
Scaler Mode bit SM
Bit 11 (13) Mode
Binary Counts - binary data sent to the outputs and returned from the
0 binary
Binary Counts - binary data sent to the outputs and returned from the
inputs is calibrated, but not scaled, providing maximum possible
1 default
inputs is calibrated, but not scaled, providing maximum possible
resolution.
Default Scaling When this bit is set to 1 default scaling is in effect
1 user
Default Scaling - When this bit is set to 1, default scaling is in effect.
Module
Mode
Range
Default Default Approximate
Bit 11
Mode
Bit 11 (13) Bit 09 (11) Bit 08 (10)
Default
Minimum
Default
Maximum
Approximate
Default Resolution
Word 0
Bit 11
(13) 0 0 0 -10000 +10000 14 Bits ( 3)
0 0 1 -5000 +5000 13 Bits
1 0 1 -20000 +20000 14 Bits
0 1 0 0000 +10000 13 Bits
0 1 1 0000 +5000 12 Bits
1 1 1 0000 +20000 14 Bits
Default scaling for the output is determined by the catalog number as follows:
Catalog Number
Default
Minimum
Default
Maximum
Approximate
Default Resolution
1791ĆN4V2, ĆNDV -10000 +10000 14 Bits
1791ĆN4C2, ĆNDC 00000 +20000 13 Bits
Range selection bits. Bit 08 (10) selects voltage and bit 09 (11) selects unipolar or bipolar mode.
Bits 08-09 Bit 09 (11) Bit 08 (10) Range Bits 08 09
(10-11) 0 0 +10V
0 1 +5V
1 0 0-10
1 1 0-5
Bits 00-03 Digital Filter selection. Default of 0000 selects No Filter. Refer to Table 5.B.
Word 1 Bits 00-15 (00Ć17) Output data for channel 0.
Word 2 Bits 00-15 (00Ć17) Output data for channel 1.
Word 3 Bits 00-15 (00Ć17) Not used.