11
OMEGA DPU91-BC Batch Controller System
The DPU91 Open Collector (R1) output provides high-speed switching capability.
Signal frequencies can reach 400 pulses per minute.
The DPU91 Open Collector (R1) output connection is dependent upon the type of
circuit being controlled by the output.
Most indicating instruments or control system inputs require a signal voltage of 0 to 5 V
(TTL or CMOS logic levels) or 0 to 24 V. Therefore, the DPU91 Open Collector output
circuits must be equipped with a pull-up or pull-down resistor (not supplied), and a
quality regulated 5 to 24 V (depending on the application) power supply (not supplied)
is recommended to function properly.
PWR +
PWR –
Loop +
Loop –
OC –
OC +
Power
Supply
V+
Gnd
Alarm
with NORMAL
set to OPEN.
PWR +
PWR –
Loop +
Loop –
OC –
OC +
Pull-Up Resistor
..ȍ:
Power
Supply
9WR9
Gnd
PLC
Gnd
Input
If an external device needs logic 0
(logic LOW) input when the Open
Collector is de-energized in an NPN
con
fi
guration, set R1 NORMAL to
CLOSED in the RELAY menu.
NPN Style Wiring
OC +
Pull-Down Resistor
..ȍ:
Power
Supply
9WR9
Gnd
PLC
Gnd
Input
3:5
3:5±
Loop +
/RRS±
2&±
PNP Style Wiring
• Longer life than a mechanical relay
• No moving parts
• Faster ON/OFF switching capabilities than mechanical relays
• Can switch DC voltage only (< 30 VDC, < 50 mA)
• Not recommended for use with inductive loads
Fail-Safe Behavior
No matter the setting, the Open Collector output turns off if the DPU91 loses power.
This must be taken into account when evaluating system failure consequences.
If the system layout requires a “closed” or “on” condition for the output in case of
power loss, a mechanical dry-contact relay (NC contacts) must be used instead of
the Open Collector (R1) output.
12. Open Collector Wiring