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In 300 meters of 1,5 mm2 cable, the resistance will not be a problem (less than 10 ohms), there is no loss of signal in a current loop due to loop resistance. Shielded cable is required for EMI shielding, current loops are less susceptible to EMI but it is a safe practice to use twisted pair shielded and armored cable for 4-20 mA loop.
You can use 5th slot as 8 nos. of low profile relay or 8 nos. of analog output or 16 nos. of digital input or 24 nos. of open collector output
- No. of analog input channel is 24