Triconex 3721 Analog Input Module
The 3700A, 3703E, and 3704E, 3720, and 3721 Analog Input Modules provide a six percent overrange measurement capability. The 3703E provides open-input detection, which can be configured as upscale or downscale in TriStation 1131. If an open input (< 0 VDC) goes out of range downscale, the Main Processors receive the integer value –32,767. If an open input (> 5VDC or 10 VDC) goes out of range upscale, the Main Processors receive the integer value +32,767.
The 3720 and 3721 can be configured in TriStation 1131 for either Standard (12 bit) resolution or High (14 bit) resolution. In High resolution, the 3721 can be configured in TriStation 1131 for Unipolar (0 to 5 VDC) or Bipolar (-5 to +5 VDC) inputs.
Each Analog Input Module sustains complete, ongoing diagnostics for each channel. Failure of any diagnostic on any channel activates the Fault indicator for the module, which in turn activates the chassis alarm signal. The Fault indicator points to a channel fault, not a module failure. The module is guaranteed to operate properly in the presence of a single fault and may continue to operate properly with some multiple faults.
Analog Input Modules include the hot-spare feature which allows online replacement of a faulty module. Like all I/O modules, Analog Input Modules require a separate field termination assembly with a cable interface to the Tricon controller backplane. Each module is mechanically keyed to prevent improper installation in a configured chassis.
3721 Analog Input Specifications
| Feature |
Specification |
| Color code |
Yellow |
| Number of input signals |
32 differential, DC-coupled |
| Input update rate |
10 ms |
| Resolution |
12 bits or 14 bits programmable |
| Accuracy |
< 0.15% of FSR from 0° to 60° C |
| Input resistance (load) |
10 MΩ (DC), minimum |
| Input resistance at power off |
140 kΩ (DC), typical |
| Common mode rejection (typical) |
-85 dB (DC - 100 Hz) |
| Common mode voltage range |
-12V to +12V peak |
| Channel-to-channel isolation |
420 kΩ, typical |
|
Normal mode rejection
|
-3 dB @ 23 Hz
-8 dB @ 60 Hz
-14 dB @ 120 Hz
|
|
Input voltage range
|
0 to 5 or –5 to 5 VDC
|
|
Input over-range measurement
|
+6%, -5.3 to +5.3 VDC
|
|
Logic power
|
< 15 watts
|
|
Input over-range protection
|
150 VDC continuous, 115 VAC continuous
|
| Input current range |
0 to 20 mA with 250 Ω shunt resistor |
| Field to system isolation |
800 VDC minimum |
| Module status indicators |
Pass, Fault, Active, Field |
|
Input diagnostic fault coverage1
Minimum input change
Input change sample period
Minimum period of mis-compares
|
2% of full scale
20 ms
25 samples
|
100% brand new and original,All the goods will be tested before shipment.
For the in stock items, we will send the order out within 5-7 days after receive the payment.
Global supplier of quality automation and control components.
Topteng offers a 12-month warranty from the date of delivery.
In the event of non-conforming product ( if damaged or incorrect product is received ),
Any nonconformity must be reported within 7 days of receipt of goods.
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