320
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 34 - DIAGNOSTICS AND TROUBLESHOOTING
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
DIGITAL INPUTS/OUTPUTS TEST SCREEN
00340VIP
FIGURE 116 -
DIGITAL INPUTS/OUTPUTS TEST SCREEN
This diagnostic is used to analyze the Digital inputs
and outputs of the microboard. See description of I/O
of this manual.
The state of each Microboard Digital Input, Program
Jumper and Program DIP Switch, as interpreted by the
microboard, is depicted by an LED. If the microboard
interprets its input as being at a Logic Low (less than
1.0 VDC) level, the LED is illuminated. If interpreted
as being at a Logic High (greater than 4.0 VDC) level,
the LED is extinguished.
The state of the microboard’s intended drive signals to
each of the relays on the I/O Board is depicted by an
LED. If the intended output is a Logic Low level (less
than 1.0 VDC), the LED is illuminated. If the intended
output is a Logic High level (greater than 10.0 VDC),
the LED is extinguished. Logic Low outputs energize
the relays. Logic High outputs de-energize the relays.
The state of any output can be manually set to either the
Enabled (Logic Low) or Disabled (Logic High) state.
PROCEDURE
Digital inputs
1. The Digital inputs are listed on this screen accord-
ing to:
a. Terminal number on the I/O Board.
b. Microboard Program Jumpers and Program
DIP Switches.
shows the devices con-
nected to these terminals.
lists the functions
of the Program Jumpers and Switches.
2. With 115 VAC applied to a particular I/O Board
Digital Input, the applicable LED should be illu-
minated. If the LED is not illuminated, perform
appropriate troubleshooting procedure below.
3. With 0 VAC applied to a particular I/O Board
Digital Input, the applicable LED should be extin-
guished. If the LED is not extinguished, perform
appropriate troubleshooting procedure below.
4. If a Program Jumper is present, the applicable
LED should be extinguished. If the LED is not
extinguished, the microboard is defective.
5. If a Program Jumper is not present, the applicable
LED should be illuminated. If the LED is not il-
luminated, the microboard is defective.
6. If a Program Switch (DIP) is in the ON position, the
applicable LED should be illuminated. If the LED is
not illuminated, the microboard is defective.