Where can we find the Heat dissipation of individual modules of M340 & M580 series PLCs.

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For heat dissipation there's no specific document. It needs to be calculated.

Heat dissipation is the power consumption (P) in Watts of the target/module multiplied by 3.41214 (coefficient) . The result is in BTU/hr.

i.e Heat Dissipation (BTU/hr) = P * 3.41214

For power dissipation refer the attachment to calculate it.