PLC_MAGNUS
Member
I'm currently working on a PLC setup and could use some advice on the best way to manage my power supply units (PSUs). Here's the configuration:
PSU A: 24V DC, 2.5A
PSU B: 24V DC, 10A
1x CPU and 3x I/O Modules
Currently, I'm powering the CPU and the I/O modules using PSU A, with "L+" connected to 24V DC and "M" to 0V DC. My plan is to power the sensors using 24V+ from PSU B, as I'm concerned about overloading PSU A with too many amps.
However, this raises a question about how to complete the circuit for the input cards on the CPU and I/O modules. If I use 24V+ from PSU B for the sensors, it seems necessary to also use 24V- from PSU B for these input cards. This leads to a situation where I have to differentiate between the negative terminals from the two separate PSUs.
To streamline this, I'm considering wiring together the negative terminals from both PSU A and PSU B to create a common reference point. Currently, both PSUs are connected to the same earth.
Would this be a viable solution? Are there any potential issues with wiring the negative terminals of two different PSUs together in this manner? I'd appreciate any insights or suggestions you might have.
PSU A: 24V DC, 2.5A
PSU B: 24V DC, 10A
1x CPU and 3x I/O Modules
Currently, I'm powering the CPU and the I/O modules using PSU A, with "L+" connected to 24V DC and "M" to 0V DC. My plan is to power the sensors using 24V+ from PSU B, as I'm concerned about overloading PSU A with too many amps.
However, this raises a question about how to complete the circuit for the input cards on the CPU and I/O modules. If I use 24V+ from PSU B for the sensors, it seems necessary to also use 24V- from PSU B for these input cards. This leads to a situation where I have to differentiate between the negative terminals from the two separate PSUs.
To streamline this, I'm considering wiring together the negative terminals from both PSU A and PSU B to create a common reference point. Currently, both PSUs are connected to the same earth.
Would this be a viable solution? Are there any potential issues with wiring the negative terminals of two different PSUs together in this manner? I'd appreciate any insights or suggestions you might have.