Product Introduce
1769-OF8C is an 8-channel current analog output module of the CompactLogix series. The 8 single-ended current output channels can be configured independently. It supports two mainstream industrial current output modes: 0-20mA and 4-20mA. It has a 16-bit analog-to-analog conversion specification and a specific resolution of 15.59 bits in 4-20mA mode and 15.91 in 0-20mA mode. bit, the resolution is 0.323µA/bit in both modes; the accuracy is ±0.35% of full scale at 25°C, the conversion rate of all channels is 5ms, the step response to 63% output is less than 2.9ms, and it can respond quickly to control commands
Parameters with 1769-OF4CI
| Parameter | 1769-OF8C | 1769-OF4CI |
|---|---|---|
| Output Channels | 8 single-ended current outputs | 4 single-ended current outputs |
| Output Range | 0–20mA / 4–20mA (configurable) | 0–20mA / 4–20mA (configurable) |
| Resolution | 16 bits (0.323µA/bit) | 16 bits (0.323µA/bit) |
| Conversion Rate | 5ms (all channels) | 3ms (all channels) |
| Power Consumption | 5V DC: 145mA; 24V DC: 185mA | 5V DC: 85mA; 24V DC: 100mA |
| Isolation Voltage | 500V AC (output group to bus) | 500V AC (output group to bus) |
| Compatible Controllers | CompactLogix, MicroLogix 1500 | CompactLogix, MicroLogix 1500 |
| Typical Application | High-channel-count process control | Medium-channel-count precision control |
FAQ:
1.How do I configure the 0–20mA/4–20mA output range of the 1769-OF8C in Studio 5000?
- Add a module: Open the project → expand I/O Configuration → right-click the backplane to add 1769-OF8C and specify the physical slot.
- Enter the configuration interface: double-click the module, switch to the Configuration tab, and select the channels to be configured (batch selection is supported).
- Set range and parameters
- Select 0–20mA or 4–20mA in Output Range.
- In engineering unit mode: 4–20mA corresponds to the limit value 4000/20000; 0–20mA corresponds to 0/20000.
- Valid configuration: Save the parameters and download them to the controller. Restart the controller to make the configuration effective.
- Verification: Write a test program to output the value, use a multimeter to measure the channel output, and confirm that the reading matches the set range.
2.Is there any difference in conversion rate between 1769-OF8C single channel output and multi-channel simultaneous output?
There is no difference in slew rate between the 1769-OF8C single channel output and the simultaneous output of multiple channels.
3.Is an external 24V DC power supply required for the 1769-OF8C? What are the consequences of disconnecting the external power supply?
An external 24V DC power supply is required for the 1769-OF8C. The backplane power supply only supports logic communication and cannot drive analog outputs.
Consequences of disconnecting external power supply:
- The 8 current output channels completely failed, and the actuators (regulating valves, frequency converters, etc.) lost control signals.
- The module LED goes out, the diagnostic function fails, and the fault cannot be rectified.
- Failure of the over-current and short-circuit protection functions may damage the internal components of the module.
- The communication between the module and the controller is interrupted, and the system triggers an I/O offline alarm.
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