Instruction Manual

Analog Block Applications Using
Block Transfers
Chapter 4
4-4
The bit/word descriptions are shown in Table 4.B.
Table 4.B
Bit/Word
Descriptions for the Block T ransfer W rite Instruction
Word
Decimal Bit
(Octal Bit)
Description
Module Mode. Bits 1215 (1417) determine the operation of the block module.
Bit 15 (17) 14 (16) 13 (15) 12 (14)
Bits 1215 (1417)
0 0 0 0 Normal operation with voltage inputs
Bits 1215 (1417)
0 0 0 1 Normal operation with current inputs
1 1 0 0
Calibration operation (refer to
Chapter 7)
Scaler Mode
Bit 11 (13) 10 (12) Mode Binary Counts  binary data sent to the
outputsandreturnedfromtheinputsis
0 X binary
outputs and returned from the inputs is
calibrated, but not scaled, providing maximum
possibleresolution
1 0 default
possible resolution.
User Scaling  the input and output data are
scaledbythevaluesinwords3thru6for
1 1 user
scaled by the values in words 3 thru 6 for
outputs, and words 7 thru 14 for inputs.
Default Scaling Values are shown below:
Module
Range
Default Default Approximate
Bits 1011 (1213)
Module
Mode
Bit 12 (14)
Bit 09
(11)
Bit 08
(10)
Default
Minimum
Default
Maximum
Approximate
Default Resolution
0 0 0 10000 +10000 14 Bits
0 0 1 5000 +5000 13 Bits
Word0
1 0 1 20000 +20000 14 Bits
Word 0
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
1791N4V2, NDV 10000 +10000 14 Bits
1791N4C2, NDC 00000 +20000 13 Bits
Range selection bits. Bit 08 selects voltage and bit 09 selects unipolar or bipolar.
Bit
Range
Bits 0809 (1011) 09 (11) 08 (10)
Range
()
0 0 +10V
0 1 +5V
1 0 010
1 1 05
Bits 0407
Alarm Enable bits. Enables input alarm when set (1). Bit 04 corresponds to channel 0, bit 05
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.