TTL Output Module
Cat. No. 1771OG
Installation Instructions
7
The front panel of your module contains nine status indicators (Figure 1).
The red top indicator is labeled ‘‘HIGH = TRUE.” When on, it indicates
you selected high-true logic (SW1 on and SW2 on). When off, it indicates
you selected low-true logic (SW1 off and SW2 on).
Each of the lower eight red indicators light when their corresponding
output terminal delivers TTL voltages in the true state.
Indicators may appear dim during rapid pulsing of output signals.
Figure 1
Status Indicators
HIGH = TRUE indicator
Output 0
Output 1
Output 2
Output 3
Output 4
Output 5
Output 6
Output 7
Status Indicators
10448-I
Interpreting the Status
Indicators