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Sharing Process Variables: Analog Isolation

When sharing one Process Variable (PV) with multiple systems, the connection needs to be thought out carefully.  Creating a series connection for the 4-20mA signal is not a best practice for sharing the PV. The main problem in creating a series connection is when either the DCS or the PLC input is disconnected, intentionally or by accident, both the DCS and the PLC will lose the PV signal.
Published: August 23, 2017

E-HELP: SIX Maintains Passive Resistance Regardless of Power

E-HELP: SIX Maintains Passive Resistance Regardless of Power
Q: Will the SIX Signal Isolator/Converter pass input signals through if the output is disconnected? We will be replacing our DCS, so we need to know if the input side will continue to work while the DCS is disconnected.
Published: August 18, 2017

E-HELP: Adjustable Deadband Thermocouple Alarms

E-HELP: Adjustable Deadband Thermocouple Alarms
Q: We currently are using TCA Thermocouple Alarm units in our plant (model TCA/K-10MV/SX1/117AC/[STD]). The user’s manual says that the deadband is fixed at 1% of the input range. However, we need the TCA to trip at a set point of 190°F and reset at 180°F. Is this model capable of meeting this requirement and do you still manufacture this model?
Published: August 16, 2017

SLD Functional Safety Programmable Loop Display

SLD Functional Safety Programmable Loop Display

Moore Industries introduces the new universal SLD PC-Programmable Functional Safety Loop Display features a large integral display.

Published: August 11, 2017

HCS: HART Concentrator System HART-to-MODBUS RTU Converter

HCS: HART Concentrator System HART-to-MODBUS RTU Converter
HART® Concentrator System HART-to-MODBUS RTU Converter
Published: August 10, 2017
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