AtlasPC Digital Control, Vol. I
Manual 85586V1
46
Woodward
Actuator Outputs
Number of channels
2
Actuator Type
Proportional, non-isolated
Output Type
4-20 or 20-160 mA, software selectable
Isolation none
Max current output
25mA
±
5%
(4-20 mA output scale)
200 mA
±
5%
(20-160 mA output scale)
Min. load resistance
0
Ω
Max load resistance
300
Ω
at 22 mA
(4-20 mA output scale)
45
Ω
at 200 mA
(20-160 mA output scale)
Resolution 12
bits
Accuracy @ 25 °C
less than ±0.1% of full scale,
0.026 mA
(4-20 mA output scale)
0.2 mA
(20-160 mA output scale)
Readback Accuracy @
25 °C
0.5%
Temperature Drift
140 PPM/°C maximum,
0.24 mA maximum
(4-20 mA output scale)
1.82 mA maximum
(20-160 mA output scale)
70 ppm/°C typical
0.45% of full scale,
0.12 mA
(4-20 mA output scale)
0.91 mA
(20-160 mA output scale)
Readbacks
Actuator source and return currents
Dither Current
25 Hz, fixed duty cycle, software variable amplitude
Discrete Inputs
Number of channels
24
Input type
Optically isolated discrete input
Input thresholds
< 8 Vdc = “OFF”
> 16 Vdc = “ON”
Input current
3 mA @ 24 Vdc
Contact voltage
24 Vdc isolated
Max input voltage
28 Vdc
Isolation voltage
500 Vac, all channels are isolated from the AtlasPC platform
•
For EMC compliance, the on-board, isolated, +24 Vdc supply is
recommended for use as power to contacts, 100 mA maximum.
•
All channels are common to each other. Isolation is with respect to the
AtlasPC platform and other I/O types.
Serial I/O
Number of channels
3
Channel configuration
1 - RS-232, 9 pin sub D connector
2 - RS-232/RS-485/RS-422 software configurable, terminal block
connections
Termination Resistor
Located on the board and are accessible via field wiring.
Termination resistors are provided for RS-485 and RS-422
Receive.
Isolation Voltage
500 Vdc
Summary of Contents for AtlasPC
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