DPM-500 Analog Input Meter Instruction Manual
15
External Relays & Digital I/O Connections
The relay and the digital I/O expansion modules PDA1004 & PDA1044 are connected to the meter using
a CAT5 cable provided with each module. The two RJ45 connectors on the expansion modules are
identical and interchangeable; they are used to connect additional modules to the system.
Note: The jumper located between the RJ45 connectors of the PDA1044 must be removed on the second
digital I/O module in order for the system to recognize it as module #2.
Warning!
Do not connect or disconnect the expansion
modules with the power on!
More detailed instructions are provided with each
optional expansion module.
Figure 16. Expansion Modules & DIN Rail
Mounting Kit
Figure 17. External Relays Module
Connections
Figure 18. Digital I/O Module Connections
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 35).
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 19. Interlock Connections
1
2
RLY5
RLY6
RLY7
RLY8
3
4
5
6
7
8
NO
C
NO
C
NO
C
NO
C
1
2
3
4
5
6
+5
I1
I2
I3
I4
O1
7
8
O2
O3
9
10
O4
G
DI 1-4
DO 1-4
5 VDC
GND
