Yokogawa PW301 DCS system spare parts

Yokogawa PW301 DCS system spare parts

Technical data of product parameters

Each personality module has PW301a simplified wiring diagram label on its side which
appears above the terminal block. This diagram indicates how the wiring from the
field is to be connected to the terminal block in the base unit. The diagrams for the
HART Analog Output Personality Modules are illustrated in Figure 14-3. The
following table lists and defines the abbreviations used in those diagrams.The maximum length of cable per HART network is dependent on the PW301
characteristics of the devices connected to the network and the characteristics of the
cable to be used.
In a HART network, long cable lengths are possible when the dominant low
impedance device (the HART field device) has an input impedance of
approximately 250 ohms and the signal cable is good quality having low
capacitance (Cx) and resistance (Rx) per unit length.
Cx – Cable capacitance per unit length (feet or meters): The capacitance from one PW301
conductor to all other conductors (including the shield if shielded). This value is PW301
usually available from the cable manufacturer.
Rx – Cable resistance per unit length (feet or meters): This value should be available
from the cable manufacturer. Table 13-5 contains the resistance values of some
common copper wire sizes. The resistance per unit length is for a single wire but the
length calculations and charts take into account the resistance of both wires.Refer to field device manufacturer’s literature for more information on cabling
lengths since device impedances may vary among field devices. In addition, refer to
the HART FSK Physical Layer Specification (HCF_SPEC – 54) for additional
information

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