ProtEX-MAX PD8-6100 Strain Gauge, Load Cell, and mV Meter
Instruction Manual
29
Digital I/O Connections
Digital inputs and outputs are provided in order to
expand the functionality of the meter. Digital input
connections are made via a push button or switch to
the appropriate digital input terminal and the +5 VDC
terminal. Digital output connections are made by
wiring from the appropriate digital output terminal to
the ground terminal.
Figure 19. Digital Input and Output Connections
The onboard digital inputs (1-4) are configured at the
factory to function identically to the front panel
pushbuttons (Menu, F1, F2, & F3) in order to work
with the SafeTouch buttons. Changing the
programming of the digital inputs will affect the
function of the SafeTouch buttons.
If you wish to change the behavior of the digital
inputs, re-assign F1-F3 to the desired function, then
change the corresponding digital input to match.
•
DO NOT
disconnect the RJ45 M-LINK connector
cable. Otherwise the instrument will not function
properly.
F4 Digital Input Connections
A digital input, F4, is standard on the meter. This
digital input should be connected with a normally
open contact across F4 and COM, or with an active
low signal applied to F4. It can be used to operate the
tare function, for remote operation of front-panel
buttons, to acknowledge/reset relays, or to reset
max/min values. See
capabilities.
Figure 20. F4 Digital Input Connections
4-20 mA Output Connections
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled mA OUT.
The 4-20 mA output may be powered internally or
from an external power supply.
Figure 21. 4-20 mA Output Connections
Analog Output Power Supply
If the analog output is not using the 24 VDC supply to
power the output loop, it can be used for other things.
The I+ Terminal is the +24 V and the R terminal is the
return.
Figure 22. Analog Output Supply
Powering Other Devices
Remote Programming
The meter can be operated via the programming
buttons or a remote control station with required
approvals to be located in a hazardous area using the
digital inputs and outputs.
4-20 mA Input
Remote Display, PLC,
Chart Recorder, Etc.
-
+
R
I-
I+
1
3
2
RELAY1
mA OUT
24 V
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-
+
R
I-
I+
1
3
2
RELAY1
3
2
1
-
24 V
mA OUT
Internal Power Supply
and Analog Output
3
2
1
Active Output Loop
Passive Output Loop
R
I-
I+
1
3
2
24 VDC
Powered
Device
24 V
+
-
Summary of Contents for ProtEX-MAX PD8-6100
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