Section 3.3 Input Image File; Input Data Values; General Status Bits (S0 To S7); Input Data Not Valid Condition - Spectrum Controls 1769 Series User Manual

Section 3.3
Input
Image File
The input image file represents data words and status words. Input words 0
through 5 hold the input data that represents the value of the analog inputs for
channels 0 through 5. These data words are valid only when the channel is
enabled and there are no errors. Input words 6 and 7 hold the status bits. To
receive valid status information, the channel must be enabled.
You can access the information in the input image file using the programming
software configuration screen. For information on configuring the module in a
MicroLogix 1500 system using RSLogix 500, see Appendix C; for
CompactLogix using RSLogix 5000, see Appendix D.
Section 3.4
Input
Data File
The input data table allows you to access module read data for use in the control
program, via word and bit access. The data table structure is shown in table
below.
Table 3-6 (Input Data File)
Word/Bit
0
1
2
3
4
5
6
7

3.4.1 Input Data Values

Data words 0 through 5 correspond to channels 0 through 5 and contain the
converted analog input data from the input device. The most significant bit, bit
15, is the sign bit (SGN).

3.4.2 General Status Bits (S0 to S7)

Bits S0 through S5 of word 6 contain the general status information for channels
0 through 5, respectively. Bits S6 and S7 contain general status information for
the two CJC sensors (S6 corresponds to CJC0, S7 to CJC1). If set (1), these bits
indicate an error (over- or under-range, open-circuit or input data not valid
condition) associated with that channel. The data not valid condition is described
below.

Input Data Not Valid Condition

The general status bits S0 to S5 also indicate whether or not the input data for a
particular channel, 0 through 5, is being properly converted (valid) by the
Chapter 3: Module, Data, Status, and Channel Configuration
15 14 13 12
OC7 OC6 OC5 OC4
O7 O6 O5 O4
11 10 9 8
Analog Input Data Channel 0
Analog Input Data Channel 1
Analog Input Data Channel 2
Analog Input Data Channel 3
Analog Input Data Channel 4
Analog Input Data Channel 5
OC3 OC2 OC1 OC0
O3 O2 O1 O0
User's Manual Pub. 0300244-02 Rev. A
3-11
7 6 5 4 3
S7 S6 S5 S4 S3
U7 U6 U5 U4 U3 U2
2 1 0
S2 S1 S0
U1 U0