Rockwell Automation 1746-NI8 SLC 500 Analog Input Modules User Manual - Manual (Page 56)

Chapter
6
Publication 1746Ć6.8 - April 1997
Ladder Logic Configuration
Examples
Earlier chapters explained how the configuration word defines the
way a channel operates. This chapter shows the programming
required to enter the configuration word into the processor memory.
It also provides you with segments of ladder logic specific to unique
situations that might apply to your programming requirements. The
example segments include:
•
initial programming of the configuration word
•
interfacing the analog module to a PID instruction
•
monitoring channel status bits (Class 3 Mode only)
To enter data into the channel configuration word (O:e.0 through
O:e.7) when the channel is disabled (bit 11 = 0), follow these steps.
Refer to page
5–2 for specific configuration details.
Example - A 1746-NI8 analog module is residing in slot 3 of a 1746
chassis. Configure all eight channels with the same parameters.
•
Input Type:
4-20 mA
•
Data Format:
scaledĆforĆPID
•
Open Circuit:
zero if open circuit
•
Filter Frequency:
10 Hz
•
Channel Enable:
enabled
•
Not Used
Bit Setting
ЙЙЙЙ
ЙЙЙЙ
11 12 13 14 15
0 0 0 0
9 10 8 6 7 4 5 0 1 2 3 Bit Number
1 1 0 0 0 0 1 1 0 1 0 0
This example transfers configuration data and sets the channel enable
bits of all eight channels with a single File Copy instruction.
Initial Programming