Rockwell Automation 57C419 5V-24V DC Input Module - Manual (Page 10)

2Ć2
+
5Ć24VDC
Input
Input Isolator
Data
Buffer
Figure 2.1 Ć Typical Input Circuit
There are 32 LED indicators on the faceplate of the module. The LED
indicators display the status of the logic level circuitry. Proper
operation of an LED indicates that both the input circuit and the logic
level circuitry are operating correctly.
The LEDs are arranged as four groups of eight and are numbered
from0Ć31. See figure 2.2. LEDs numbered from0Ć15 correspond to
the inputs in register 0. LEDs numbered from 16Ć31 correspond to
the inputs in register 1.