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As a simple solution for handling the HART maintenance signals passing to and from the field devices the HTP-SC32 will often be the primary method of choice. It is intended for analogue input signals but may also be used for analogue outputs if the host system is compatible with HART communications. Able to handle up to 32 channels through its screw-clamp field and system terminals, it is a convenient way to integrate HART maintenance facilities. The HTP-SC32 provides a self-contained solution because the MTL4850 HART multiplexer is already on-board and requires only DC power and a simple RS485 link to the host management PC to get started. Two terminals are provided for each channel enabling connections to be made to 2-wire transmitters,
4/20mA current loops or voltage inputs. Each channel is isolated so it may be connected to any suitable point in the analogue loop, and input and output types may be mixed. HART signals have to be terminated into an impedance of >240W, so provision is made on the circuit board to fit parallel resistors - normally 250W - or a series resistor if the input impedance at the point of
connection is <240W. Various models are available to suit these termination options. Table 4.1 identifies the models and their specific differences and Figure 4.2 shows how these models are used.
The HTP-SC32 has a removable, 4-way, screw-clamp terminal connector that provides redundant 24Vdc supply connections. LED indicators are provided to indicate the presence of power to each of the redundant power inputs. A series diode in each supply input means that the higher of the two voltage supplies is used and there is an automatic switch-over of supplies if one fails. A 0.5A inline fuses protect against over current.
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