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10 UDC 3300 Controller Product Manual 4/00
Design (continued)
Digital Inputs
(Optional) (Isolated)
+15 Vdc source for external dry contacts or isolated solid state contacts. The
Digital Input option detects the state of external contacts for either of the two inputs.
On contact closure the controller will respond according to how each digital input is
configured. Opening contact causes return to previous state.
Auxiliary Linear
Output (Optional)
(Isolated)
21 mA dc maximum into a negative or positive grounded load or non-grounded load of 0 to
1000 ohms.
Output range can be set anywhere between 0 mA to 21 mA, and as direct or reverse
action. It can be configured to represent either Input, PV, Setpoint, Deviation, or Control
output. The range of the auxiliary output, as a function of the selected variable, can be
scaled. This output can be used as a second current output for current duplex outputs.
Resolution: 12 bits over 0 mA to 21 mA
Accuracy: 0.05 % of full scale
Temperature Stability: 0.0075 % F.S./°C
Load Resistance: 0 to 1000
Communications
Interface (Optional)
DMCS
Baud Rate: 19200 baud
Length of Link: 4000 ft. maximum
Link Characteristics: Two-wire, multi-drop proprietary protocol, 31 drops maximum
RS422/485 ASCII
Baud Rate: 2400, 4800, 9600, or 19200 baud selectable
Parity: Odd or Even
Length of Link: 4000 ft. maximum
Link Characteristics: Two-wire or four-wire, multi-drop RS422 ASCII, 15 drops maximum or
up to 31 drops for shorter link length.
RS422/485 Modbus
RTU
Baud Rate: 2400, 4800, 9600, 19200 baud selectable
Data Format: Floating point or integer
Length of Link: 4000 ft. maximum
Link Characteristics: Two-wire, multi-drop Modbus RTU protocol, 15 drops maximum or up
to 31 drops for shorter link length.
Power Consumption
18 VA maximum (90 Vac to 264 Vac); 12 VA maximum (24 Vac/dc)
Power Inrush Current
10A maximum for 4 ms (under operating conditions)
CAUTION
When applying power to more than one UDC 3300, make sure that sufficient
power is supplied. Otherwise, the controllers may not start up normally due to voltage drop
from the inrush current.
Weight
1.3 kg (3 lb.)