PD2-6262 Helios Large Display Analog Dual-Input Rate/Totalizer Instruction Manual
19
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 Transmitter Power Supply
The internal 24 VDC power supply powering the analog output may be used to power other devices, if the
analog output is not used. The I+ terminal is the +24 V and the R terminal is the return.
Interlock Relay Feature
As the name implies, the interlock relay feature reassigns one, or more, alarm/control relays for use as
interlock relay(s). Interlock contact(s) are wired to digital input(s) and trigger the interlock relay. This
feature is enabled by configuring the relay, and relative digital input(s) (see page 45). In one
example, dry interlock contacts are connected in series to one digital input which will be used to force on
(energize) the assigned interlock power relay when all interlock contacts are closed (safe). The interlock
relay front panel LED flashes when locked out. The interlock relay would be wired in-series with the load
(N/O contact). See below.
Figure 22. Interlock Connections
External Analog Output Connection
The analog out expansion module PDA1011 is connected to the scanner using a CAT5 cable provided with the module.
The two RJ45 connectors on the I/O expansion module are identical and interchangeable; they are used to connect
additional modules to the system. See LIM1044, Expansion Module Instruction Manual, for details.
Warning!
Do not connect or disconnect the expansion modules with the power on!
More detailed instructions are provided with each optional expansion module.
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-
+
R
I-
I+
1
3
2
RELAY1
3
2
1
24 V
-
4-20 mA Input
Remote Display,
Chart Recorder, Etc.
-
+
R
I-
I+
MA OUT
1
3
2
RELAY1
3
2
1
24 V
MA OUT
