Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 109
The CPU also tells this module in which rate group each channel is to run, as well as special information.
At run time, the CPU then periodically broadcasts a "key" to all I/O cards, telling them which rate groups
are to be updated at that time. Through this initialization/key broadcast system, each I/O module handles
its own rate-group scheduling with minimal CPU intervention.
Troubleshooting Guide
MPUs
If a magnetic pickup input is not functioning properly, verify the following:
1. Check that the cable is shielded and the shield is properly grounded per the Shields and Grounding
section in Chapter 15, Installation.
2. Measure the input voltage on the terminal block. It should be in the range of 1-25 VRMS.
3. Verify that the signal waveform is clean and void of double zero crossings.
4. Verify that no ground connection exists and that the resulting 60 Hz signal is absent.
5. Measure the frequency. It should be in the range of 50 Hz - 25 kHz.
6. Check the wiring. Look for a loose connection at the terminal blocks and disconnected or
misconnected cables.
7. Check the software configuration to ensure that the input is configured properly.
8. If the readings are incorrect on several channels of the module, replace the Speed module.
9. If replacing the module does not fix the problem, replace the FTM. See instructions for replacing the
FTM in Chapter 15, Installation. The FTM does not contain any active components on the MPU
inputs, so replacing it should be the last option.
Eddy Probes
If a eddy probe input is not functioning properly, verify the following:
1. Check that the cable is shielded and the shield is properly grounded per the Shields and Grounding
section in Chapter 15, Installation.
2. Measure the input voltage on the terminal block. It should be in the range of 7 - 24 V-peak.
3. Verify that the signal waveform is clean and void of double zero crossings.
4. Verify that no ground connection exists and that the resulting 60 Hz signal is absent.
5. Measure the frequency. It should be in the range of 1 Hz to 25 kHz.
6. Check the wiring. Look for a loose connection at the terminal blocks, disconnected or misconnected
cables.
7. Check the software configuration to ensure that the input is configured properly.
8. If the readings are incorrect on several channels of the Speed module, replace the Speed module.
9. If replacing the module does not fix the problem, replace the FTM. See instructions for replacing the
FTM in Chapter 15, Installation.
Recommendation:
The module should be returned to Woodward every 6 years for
health check and technical updates. This health check shall
increase in frequency when the module is more than 20 years old.
9.28—24/8 Analog Smart Plus Module
9.28.1—Module Description
The 24/8 Analog Smart Plus module is a MicroNet Plus module that will allow the customer to access
information about the module during operation via AppManager.
Firmware upgrade can be performed using Service Pack installation via AppManager.
A 24/8 Analog Smart Plus module contains circuitry for twenty-four analog inputs and eight 4-20 mA
outputs. These modules have no potentiometers and require no calibration. A module may be replaced
with another module of the same part number without any adjustment.
The 24/8 Analog Smart Plus Modules come in three different configurations.
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