5 flowchart (sequence of operations) example, 1 define functionality, Flowchart (sequence of operations) example – High Country Tek emc-3L User Manual
Page 8: Define functionality, 5flowchart (sequence of operations) example

5
Flowchart (Sequence of Operations) Example
This example will demonstrate how to create a flowchart and Sequence of Operations. This example may or
may not work; it is for educational purposes only.
5.1 Define
functionality
Programming
Team:
Paul
–
Programmer,
Electrical
Engineer
Mark
–
Program
Manager
Amanda
–
Application
Engineer
Todd
–
Hydraulics
Engineer
Date:
6/4/08
Program
Description:
Using the HCT DVC family, control steering and propulsion functions of a new skidsteer model
Using a j1939 equipped diesel engine.
Functional
Description:
The operator has control over one joystick. Critical functions are the engine rpm > 1000rpm and high
side pressure is below 2000psi, then the system looks for input from the joystick as indicated below.
Joystick has 5 positions
Joystick forward – skidsteer moves forward motion
Joystick back – skidsteer moves in reverse motion
Joystick right – skidsteer turns right
Joystick left – skidsteer turns left
Joystick center – skidsteer stops in present position
I/O
needed
Inputs Joystick forward
digital input 1, active high
Joystick
back
digital
input
2,
active
high
Joystick
right
digital
input
3,
active
high
Joystick
left
digital
input
4,
active
high
Joystick
center
digital
input
5,
active
high
Left wheels, high side press. Trans
0-3000psi transducer, 0-5v, 0-100% input
Right wheels, high side press. Trans
0-3000psi transducer, 0-5v, 0-100% input
Engine
load
j1939
signal
Engine
rpm
j1939
signal
Outputs
Left wheels pump forward control pwm Min cur 0.2a, Max cur 0.9a
Left wheels pump reverse control pwm Min cur 0.2a, Max cur 0.9a
Right wheels pump forward control pwm Min cur 0.2a, Max cur 0.9a
Right wheels pump reverse control pwm Min cur 0.2a, Max cur 0.9a
Turning left indicator, bang bang out
LED indicator along with standard relay
Turning right indicator, bang bang out
LED indicator along with standard relay
PN 021-00154-QSG, Rev A.2
Quick Start Guide
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