Festo CPX-4AE-T Manual Del Usuario página 18

Screening
When connecting the cable screening, the following vari-
ants are permissible:
– Screened connection to the FE pin of the I/O plug with-
out connection to additional potential,
– External FE connection without connection to the FE
pin of the I/O plug.
Recommendation: Connect the cable shield to both sides
of the FE with sufficient equipotential bonding. If the cable
screen is connected to one side of the FE, it should be con-
nected to the "signal receiver" side.
Cold junction compensation (only for CPX-4AE-TC)
Cold junction compensation is required for precise
measurement using thermocouplers (TC), so that the abso-
lute temperature at the measuring point can be recorded
exactly. Cold junction compensation eliminates the influ-
ence of the ambient temperature, especially in the environ-
ment of the plug connector and the connection block.
Note
The CPX-4EA-TC module has internal cold junction com-
pensation that ensures sufficient accuracy of measure-
ment in certain applications.
The internal cold junction compensation is fixed at a
constant ambient temperature of 25°C. If the actual
ambient temperature of the module deviates from this
reference value, the internal cold junction compensa-
tion has a negative impact on the accuracy of the
measured values.
18 Festo CPX-AX-T 1107d English