Rockwell Automation 1771-IGD TTL Input Module Installation Instructions - Manual (Page 11)

TTL Input Module 11
Publication 1771ĆIN022B-EN-P - September 2002
The front panel of your module contains 18 status indicators. The
green top indicator is labeled ‘‘ACTIVE.” This indicator is on when
the fuse is good. The green bottom indicator, when on, indicates you
selected high-true logic. When off, it indicates you selected low-true
logic.
Each of the 16 red status indicators light when their corresponding
input terminal senses TTL voltages in the true state.
To replace a blown fuse, proceed as follows:
!
ATTENTION
Remove power from the 1771 I/O chassis
backplane and field wiring arm before removing
or installing an I/O module.
•
Failure to remove power from the backplane or
wiring arm could cause module damage, degra-
dation of performance, or injury.
•
Failure to remove power from the backplane
could cause injury or equipment damage due to
possible unexpected operation.
1. Turn off power to the chassis.
2. Remove the module from the I/O chassis.
3. Remove the blown fuse from the fuse holder (accessible through
the slot in the side cover), and replace with a 0.5A, 250V normal
blow fuse.
4. Reinsert module into the I/O chassis.
5. Turn on power to the chassis.
Inputs per Module 16
Module Location 1771ĆA1B thruĆA4B or later I/O chassis,
1771ĆAM1, and ĆAM2 I/O chassis.
Input Voltage Rating HIGH = TRUE
LOW = TRUE
ON: 2.0 to 5.25V dc
OFF: -0.2 to +0.8V dc
ON: -0.2 to +0.8V dc
OFF: 2.0 to 5.25V dc
Customer Current Sink
Requirements
7mA maximum (source per input)
0.8mA maximum (sink per input)
Customer Supply Voltage 5.0V dc (+0.25V) Class 2
50mV peakĆtoĆpeak ripple max.
Specifications continued on next page.
Interpreting the Status
Indicators
ACTIVE
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
Module Active
Indicator
(green)
00 to 17 Status
Indicators (red)
HIGH
Positive Logic
Indicator
(green)
10451ĆI
Replacing the Fuse
Specifications