Simon,
I know it's out of my league, but out of curiosity, what is the price tag
for that setup?
Thanks --Doug J
In a message dated 4/1/2005 5:05:11 PM Central Standard Time,
dr_redus@devtex.net writes:
Simon,
For the 1 atm sub I have under fabrication, I am
using an Automationdirect (http://web4.automationdirect.com/adc/Home/Home),
DirectLogic 205 series PLC (Programmable Logic Controller) with a 6"
color touch screen display which is used to interface with the
controller and for all gage displays. The PLC base has 9 modules, 1 CPU,
3 analog input, 1 digital input, 1 RTD input, 1 analog output and two
relay output modules. The PLC is currently configured with 20 analog
input channels, 12 digital input channels, 4 RTD temperatures inputs, 4 analog
output channels, and 18 relay output channels. The CPU module (DL 260),
which is about the size of a bar of soap, has two RS232 ports, one of
which is used to connect to my compass/roll/pitch sensor and the other is
connected to the touch screen display. A dual axis joy stick is
used for roll and pitch analog input to the PLC and a potentiometer
on the rudder pedals is used as an analog input for yaw control.
The joystick has 6 switches that I use for blowing and flooding the MBT
and VBT as well as moving the trim weight forward or aft via a power
screw driven by a hydraulic motor. This setup gives me fly
by wire capability. A laptop PC was used to write the ladder logic,
design the screens and download the ladder logic and screens into the PLC. All
is working fine on the bench and I found the system to be quite flexible in
changing inputs and outputs to the PLC and modifying display screens.
A PLC was chosen over a hardened PC for
robustness and to minimize space. The PLC is powered from either the main
battery bank (120 VDC) via a DC-DC converter (120 VDC to 24 VDC) or
from an independent emergency battery pack (24 VDC).
Cliff
----- Original Message -----
Sent: Friday, April 01, 2005 5:08
AM
Subject: [PSUBS-MAILIST] computers in
subs
NEW TOPIC!!
Who
uses onboard computers on their subs? Are you using modified
trimix SCUBA
computers, or homebrew type stuff?
Simon,
You mean a dive computer or a normal? On a 1 atm sub a
deco computer makes no sense.
If my sub is operational again; I consider a pocket pc
for instument reading ,listing checklists, gps navigation and as video
camera display/capture.
There are probably more possebilities and it might
save space.
disadvantage: not water resistant
regards Emile
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