Spectrum Controls 1762sc-IF4OF4 - Manual (Page 30)

3-8 MicroLogix™ 1200 Analog Combo Module (4Ch IN / 4Ch Out)
User’s Manual Pub. 0300247-01 Rev. C
Section 3.5
Read Input
Data
The input data file contains module status information and analog input data for each of
the four input channels. Analog input data is read for each channel, converted to a scaled
digital value, and stored in the input file. Use the addressing scheme below to locate the
8 input words used for channels 0 through 7, respectively.
(1) I /O located on the controller (embedded I/O) is slot 0. I/O added to the controller (expansion I/O) begins
with slot 1.
The layout for the input file is shown below.
Table 3-7 (Input Data File Layout)
Word
Bits
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
General Status I:e.0 - - - - - - - - S7 S6 S5 S4 S3 S2 S1 S0
Output Status I:e.1 - LD3 U3 O3 - LD2 U2 O2 - LD1 U1 O1 - LD0 U0 O0
Input Status I:e.2 - OC7 U7 O7 - OC6 U6 O6 - OC5 U5 O5 - OC4 U4 O4
CJC Temperature I:e.3 16 Bit Word
Input Channel4
Data
I:e.4
16 Bit Word
Input Channel 5
Data
I:e.5
16 Bit Word
Input Channel 6
Data
I:e.6
16 Bit Word
Input Channel 7
Data
I:e.7
16 Bit Word
- = Not used: Bit set to 0.
S<x> = General status bit: If a bit is set (1) then there is an error associated with that
channel (i.e. under/over range).
U<x> = Under range flag bits: Applies to all input/output types.
Inputs:
When set to 1, indicates input signal is below the value in the “Low
Range” column indicated by the table above. However, the module will
continue to convert analog data to the minimum “Low Limit” value. Bit is
automatically reset (0) by the module when the under range condition
clears.
For input data types 0-20mA, 0-10V, and 0-5V, the under range flag bits
will be set when the data value is 0.
Outputs:
When set to 1, indicates the output word value set by the user is below the
”Low Range” value (depending on the data format). The channel will