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General
Block Transfer/Single
Transfer
Preliminary Adjustments
The module has programming options (Table 2.A) that are selected
by setting the five switches on the programming option switch
assembly (SW-1). These options include the choices between
encoder and counter operation, block transfer or single transfer, BCD
or binary data formats and count resolution in the encoder mode.
Table 2.A
Programming Option Switch Assembly SW 1
1
Single
See Table 2.B
On
Transfer
Multiplier for
Off
Block
Transfer
Block transfer/single transfer (switch 1) - Use single transfer
programming only when the module is in a local I/O chassis. This
type of programming shifts a single word of data each program scan
from the processor's data table to the module. It therefore takes
three program scans to send a new control word and the two preset
values to the module. However, once new data has been sent to the
module, it will remain active until another transfer updates it.
The input status word will always appear at the proper address
location in the input image table. To use single transfer
programming, switch 1 must be set to single transfer (on).
Block transfer moves all three data words from the processor to the
module in a single scan. Since the module has bidirectional block
transfer, the processor must also be programmed to read for block
transfer, or the data table will not display the status word. To use
block transfer, switch 1 must be set for block transfer (off).
Chapter
2, 3
4
Encoder
Mode
Count
Resolution
Counter
Mode
Publication 1771 UM006B-EN-P - June 2002
2
5
Binary
BCD
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