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DDMC Analog Input Process Meter / Controller
Power Connections
Power connections are made to a two-terminal
connector labeled POWER. The meter will operate
regardless of DC polarity connection. The + and -
symbols are only a suggested wiring convention.
POWER
+ -
Required External Fuse:
5 A max, 250 V Slow Blow
Figure 12. Power Connections
Signal Connections
Signal connections are made to a six-terminal
connector labeled SIGNAL. The COM (common)
terminal is the return for the
4-20 mA and the ±10 V input signals.
Current (mA) Connections
The following figures show examples of current
connections.
There are no switches or jumpers to set up for current
inputs. Setup and programming is performed through
the front panel buttons.
Figure 13. Transmitters Powered by Internal
Supply
Figure 14. Transmitter Powered by External
Supply or Self-Powered
The current input is protected against current
overload by a resettable fuse. The display may or
may not show a fault condition depending on the
nature of the overload.
The fuse limits the current to a safe level when it
detects a fault condition, and automatically resets
itself when the fault condition is removed.
The following figures show examples of voltage
connections.
There are no switches or jumpers to set up for voltage
AC or DC
inputs. Setup and programming is performed through
POWER
the front panel buttons.
The meter is capable of accepting any voltage from -
10 VDC to +10 VDC.
Serial communications connection is made to an
RJ45 connector labeled M-LINK. For interfacing to the
DDMC, use the PDA1232 for RS-232 or the PDA1485
for RS-485. The same port is used for interfacing with
all expansion modules (e.g. external relays, digital
I/O).
Relay connections are made to two six-terminal
connectors labeled RELAY1 – RELAY4. Each relay's
C terminal is common only to the normally open (NO)
and normally closed (NC) contacts of the
corresponding relay. The relays' C terminals should
not be confused with the COM (common) terminal of
the INPUT SIGNAL connector.
16
Voltage (V) Connections
Figure 15. Voltage Input Connections
Modbus RTU Serial
Communications
Relay Connections
RELAY4
RELAY3
RELAY2
6
5
4
3
2
1
6
NO
NC
C
NO
NC
C
NO
Figure 16. Relay Connections
Instruction Manual
RELAY1
5
4
3
2
1
NC
C
NO
NC
C
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