CTI Products IOB I/O Interface - Manual (Page 31)

IOB Hardware Reference System Examples
CTI Products, Inc.
68-11168-105
26
7.4 Sub-category Example
Figure 9 shows a system that uses a single IOB module to monitor two different
types of input devices. One set of input devices are alarm input and the other set
of input devices are control inputs.
Because the IOB is monitoring two different input device types, we need to divide
the IOB’s status text category in the MCNRCD.CFG file into two sub-categories
so that meaningful status messages can be displayed for either type of input
device. Before defining our custom text messages, let’s look at the configurations
for the two I/O groups. This is shown in Figure 9.
CA-80275-100
CIRCUIT
USER APPLICATION IOB
CIRCUIT
1
2
3
4
I/O BIT
I/O GROUP
NO CONNECT
1
2
3
4
I/O BIT
FAIL
ACTIVE
ALARM
ON
OFF
FULL
ALARM
I/O GROUP
CONTROL
SUB-CATEGORY
SELECTOR BIT
SUB-CATEGORY
SELECTOR BIT
Figure 9 - Alarm and Control I/O Group Configurations