User Manual

IOB Hardware Reference System Examples
CTI Products, Inc.
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7. System Examples
This section contains various examples that describe the different operating modes
of the IOB module.
7.1 General Purpose I/O Example
Figure 5 shows a general purpose I/O system that is monitored from a local PC.
CA-80277-100
CIRCUIT
USER APPLICATIONIOB
CIRCUIT
1
2
3
4
I/O BIT
I/O GROUP
1-8
RUN
ACTIVE
STEP
FAIL
(INPUT)
(INPUT)
(OUTPUT)
(OUTPUT)
Figure 5 - I/O Group Configuration
For this application, we will need to create a custom status text category in the
MCNRCD.CFG file so that the MCNRCD software can display meaningful status
messages. Before editing the MCNRCD.CFG file, we need to define our custom
text messages. Table 18 shows the functions for each I/O bit.
I/O Bit # Function Binary Weight
1 Run 01 hex
2 Active 04 hex
3 Step 10 hex
4 Fail 40 hex
Table 18 - Example System Text Definition
Next we need to create a custom text table for all possible input value field
combinations. Table 19 shows the custom text messages and the corresponding
input value fields.