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Chapter 4
Analog Block Applications Using
Block Transfers
Word
Word 0
Word 0
4-4
The bit/word descriptions are shown in Table 4.B.
Table 4.B
Bit/Word Descriptions for the Block Transfer Write Instruction
Decimal Bit
(Octal Bit)
Module Mode. Bits 12 15 (14 17) determine the operation of the block module.
Bit
Bits 12 15 (14 17)
Bits 12 15 (14 17)
Scaler Mode
Bit
Default Scaling Values are shown below:
Module
Module
Mode
Bit 12 (14)
Bits 10 11 (12 13)
0
0
1
0
0
1
Default scaling for the output is determined by the catalog number as follows:
Catalog Number
1791 N4V2, NDV
1791 N4C2, NDC
Range selection bits. Bit 08 selects voltage and bit 09 selects unipolar or bipolar.
Bits 08 09 (10 11)
(
)
09 (11)
0
0
1
1
Alarm Enable bits. Enables input alarm when set (1). Bit 04 corresponds to channel 0, bit 05
Bits 04 07
corresponds to channel 1, bit 06 corresponds to channel 2 and bit 07 corresponds to
channel 3.
Bits 00 03
Digital Filter selection. Default of 0000 selects No Filter. Refer to Table 4.C.
Description
15 (17)
14 (16)
13 (15)
0
0
0
0
0
0
1
1
0
11 (13)
10 (12)
Mode
0
X
binary
1
0
default
1
1
user
Range
Default
Default
Bit 09
Bit 08
Minimum
(11)
(10)
0
0
10000
0
1
0
1
20000
1
0
1
1
1
1
Default
Minimum
10000
00000
Bit
Range
Range
08 (10)
0
+10V
1
+5V
0
0 10
1
0 5
12 (14)
0
Normal operation with voltage inputs
1
Normal operation with current inputs
Calibration operation (refer to
0
Chapter 7)
Binary Counts binary data sent to the
outputs and returned from the inputs is
outputs and returned from the inputs is
calibrated, but not scaled, providing maximum
possible resolution
possible resolution.
User Scaling the input and output data are
scaled by the values in words 3 thru 6 for
scaled by the values in words 3 thru 6 for
outputs, and words 7 thru 14 for inputs.
Default
Default
Maximum
Default Resolution
+10000
5000
+5000
+20000
0000
+10000
0000
+5000
0000
+20000
Default
Maximum
Default Resolution
+10000
+20000
Approximate
Approximate
14 Bits
13 Bits
14 Bits
13 Bits
12 Bits
14 Bits
Approximate
14 Bits
13 Bits
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