CPU-XL VariSpark IOM 07-21
All rights reserved © ALTRONIC, LLC 2021
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16.0 INPUT/OUTPUT WIRING
16.1 To shut-off the DC-powered CPU-XL system, a special input (SHUTDOWN INPUT
terminal 4) in the Logic/Display Module is provided. This input is open for normal
operation and is connected to engine ground to initiate an ignition shutdown. Use a
switch rated 24Vdc, 0.5 amps. Refer to section 10.6 A, and Figure 11 for details.
16.2 The Logic/Display Module includes two isolated current loop inputs. The first can
be configured to control spark timing. Reference the programming instructions,
form CPU-XL VariSpark PI. See Figure 11 for Terminal Block ID.
16.3 The second current loop input can be configured to control the spark number.
Reference the programming instructions, form CPU-XL VariSpark PI. See Figure
11 for Terminal Block ID.
16.4 Two digital inputs are provided inside the ignition system. These logic-level inputs
are active when shorted to ground. The first, MISC. INPUT, controls one-step
retard, and the second, SPK OVERRIDE, controls the spark override number. See
Figure 11 for Terminal Block ID.
17.0 COMMUNICATIONS
17.1 The Logic/Display Module incorporates a half-duplex RS-485 port which is
Modbus RTU slave compliant. The protocol used follows the Modicon Modbus
RTU standard. A PC (personal computer) or a PLC (programmable logic controller)
can be connected to the RS-485 port to perform remote monitoring or control
functions. This port is also used to configure the ignition system for its application
using a PC and the CPU-XL VariSpark PC terminal software. For a complete list of
the Modbus register addresses, see section 32.0. The CPU-XL VariSpark terminal
program CD contains a PC-based Modbus compatible monitoring program which
can be used to access the ignition data remotely.
17.2 Logic/Display Module: serves as the user interface for the CPU-XL VariSpark
ignition system. A proprietary CANBUS communications format is used to
connect the Logic/Display Module to the Junction/Diagnostic Module.
17.3 An internal USB port can also be configured as another Modbus RTU interface.
18.0 DISPLAYS AND INDICATORS
18.1 A graphical, color-changing, back-lit, LCD display provides output to the user. A
sealed-membrane keypad accepts user input. The LCD display and the keypad
function together to provide an interactive user interface that prompts the user as
different functions are selected. The screen background color indicates status:
green indicates normal condition, yellow indicates a warning and remains until
a key is pressed, and red indicates a fault and remains until a key is pressed.
Pressing any key results in a white background which remains for 30 seconds.
18.2 All actions and adjustments are immediate and are performed on an incremental
basis using up and down arrow keys. All keypad adjustments, except individual
offset timing adjustments, are performed directly in non-volatile EEPROM
memory. This EEPROM memory retains previous settings even after an engine
shutdown, or an ignition power down.
18.3 Green LED indicators are provided inside the ignition unit for troubleshooting:
POWER LED:
on to indicate that the unit has power and the microprocessor is
running. The Power LED is off to indicate that the unit has no power.
TX LED:
flashes to indicate that the ignition unit is transmitting on the RS-485
serial link.
RX LED:
flashes to indicate that the ignition unit is receiving on the RS-485
serial link.
ALARM LED:
turns on to indicate that a warning or fault is present. The ALARM LED
flashes when an acknowledged warning is present.
Summary of Contents for VariSpark CPU-XL
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