Emco EE301-T, Manual

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C. 4-20mA TPI Output for SCADA.
4-20mA TPI Output option also can be incorporated in the same enclosure.
This option provides 4-20mA TPI output on the Rear Panel Terminal Block (pins 20, 21),
proportional to Taps 1 to 17, which can be used for SCADA.
TESTING PROCEDURE
Check TPI, for taps 1 to 17 & measure O/P current varies from 4 to 20mA (1mA/ tap) i.e.
tap1 = 4mA ,tap2 = 5mA & so on till tap17 = 20mA.
In case the number of taps are more or less than 17, the change in current per tap
change = 16 mA
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no. of step resistance eg. for 21 taps = 16
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20 = 0.8mA/step. Thus
tap1 = 4mA, tap2 = 4.8mA, tap3 = 5.6mA & so on.