Manual

Appendix
A
A-1
Specifications
Inputs per module 8 fully isolated differential
Module Location 1771 I/O rack - 1 slot
Input voltage ranges (nominal) +1 to +5V DC
0 to 5V DC
-5 to +5V DC
-10 to +10V DC
Input current ranges (nominal) +4 to +20mA
0 to +20mA
-20 to +20mA
Resolution 16-bit binary over full range
Accuracy Voltage: Typical - 0.01% of full scale range @ 25
o
C
Maximum - 0.05% of full scale range @ 25
o
C
Current: Typical - 0.06% of full scale range @ 25
o
C
Maximum - 0.1% of full scale range @ 25
o
C
(Includes 0.05% when using internal current resistor)
Linearity +1 LSB
Repeatability +1 LSB
Isolation Voltage +1000V peak, channel to channel, channel to ground for 1s
Input overvoltage protection voltage mode: 140V ac (rms) continuous;
current mode: 8V dc continuous
Unscaled BCD and binary output
data to the processor
0000 to +4095
10
for unipolar ranges
(0 to 5V, +1 to +5V, 0 to +20mA, and +4 to +20mA)
-4095
10
to 4095
10
for bipolar ranges
+
5V, +10V, +20mA input ranges
Input impedance >10 megohms for voltage ranges; 250 ohms for current ranges
Common mode rejection >120 db @ 60Hz and 1K ohm source imbalance
Common mode impedence >50 megohms shunted by <5 nF
Normal mode rejection >120 db @ 60Hz
Current Requirements 1.0A @ +5V from I/O chassis backplane
Open Circuit Detection Voltage mode: Open input produces upscale reading.
Current mode: Open input produces zero reading.
Time to Detect Open Circuit 10 seconds maximum
Calibration Auto-calibration (offset and gain)
Zero offset and gain adjustment for each channel via programming
terminal
Verify every six months for maintaining absolute accuracy
Power Dissipation 6.5 Watts maximum
Thermal Dissipation 22.2 BTU/hr maximum
Engineering units sent to
processor
+9999 BCD with selectable scaling
+32767 binary
Continued on next page