ROC364 Instruction Manual
3-30
Input and Output Modules
Rev Jun/05
7.
If you changed the configuration, including the history database, FSTs, and ROC Displays, save
them to disk. Refer to Section 2, Troubleshooting and Repair, for more information on
performing saves.
3.7 I/O Module Specifications
The specifications for the various I/O modules are given in this section.
3.7.1 Analog Input Modules—Loop and Differential
Analog Input Loop Module Specifications
FIELD WIRING TERMINALS
A:
Loop Power (+T).
B:
Analog Input (+).
C:
Common (–).
INPUT
Type:
Single-ended, voltage sense.
Current loop
with scaling resistor (R1).
Loop Current:
0 to 25 mA maximum range. Actual
range depends on scaling resistor used.
Voltage Sensing:
0 to 5 V dc, software configured.
Accuracy:
0.1% of full scale at 20 to 30
°
C (68 to
86
°
F). 0.5% of full scale at –40 to 70
°
C (–40 to
158
°
F).
INPUT (CONTINUED)
Impedance:
Greater than 400 k
Ω
(without scaling
resistor).
Normal Mode Rejection:
50 dB @ 60 Hz.
POWER REQUIREMENTS
Loop Source:
25 mA maximum, from ROC power
supply (V
s
= 11 to 30 V dc).
Module:
4.9 to 5.1 V dc, 6 mA maximum; –4.5 to –
5.5 V dc, 2 mA maximum (supplied by ROC).
ISOLATION
Not isolated. Terminal C tied to power supply
common.
Analog Input Differential Module Specifications
FIELD WIRING TERMINALS
A:
Not used.
B:
Positive Analog Input (+).
C:
Negative Analog Input (–).
INPUT
Type:
Voltage sense. Externally-powered current
loop sensing with scaling resistor (R1).
Voltage:
0 to 5 V dc, software configured.
Accuracy:
0.1% of full scale at 20 to 30
°
C (68 to
86
°
F). 0.5% of full scale at –40 to 70
°
C (–40 to
158
°
F).
INPUT (CONTINUED)
Normal Mode Rejection:
50 dB @ 60 Hz.
Impedance:
Greater than 400 k
Ω
(without scaling
resistor).
POWER REQUIREMENTS
4.9 to 5.1 V dc, 6 mA maximum; –4.5 to –5.5 V dc,
2 mA maximum (supplied by ROC).
INPUT ISOLATION
Greater than 400 k
Ω
input to power supply
common.