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Ethernet interface for modular DAQ

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article image Exceptional functionality in an I/O system.

EUROTHERM’s 2500 modular I/O system is now available with direct Ethernet communications allowing the system to be directly incorporated onto any existing PC network.

The Ethernet interface allows for communication to any number of 2500 racks, allowing multiple computers to monitor and/or control the I/O, eliminating multiple master communication issues that plague normal serial communication networks.

Being directly accessible on a standard PC network also allows for simple remote accessing of data.

The system uses a flexible modular "building block" concept of great flexibility to bridge the gap between accurate local analogue control systems and more complex digital process control architectures.

It incorporates a number of unique hardware and software interactions that provide fast, accurate response times for analogue process and machine control systems.

The system provides high performance, high accuracy and exceptional functionality in an I/O system, with cost effective access to a wide range of advanced functions. These include PID control with auto tuning and gain scheduling.

Designed to communicate directly with any Ethernet, Modbus, DeviceNet or Profibus master, the system can be used as a stand-alone control system or as remote I/O for signal conditioning, alarm monitoring, remote data acquisition or devolved control for systems such as PC based SCADA packages, text and graphical HMI interface screens and PLCs.

The 2500 system is available in three base sizes, taking 2, 4, 8, 10, 12 or 16 I/O modules each - allowing for up to 32 analogue and 64 digital inputs and output.

With Ethernet communications, any number of bases may be daisy chained to provide acquisition and multiloop control solutions for very large numbers of PID loops, which would normally slow down most systems.

DIN rail or panel mounting allows the 2500 to be located where the control action is required, minimising the cost of the cable used, as only the communications need be taken to the user interface.

Each control rack contains an I/O controller featuring eight high stability PID blocks, which provide an extensive range of control strategies. Each PID block offers one-shot auto tuning to optimise control performance without the need for specialist knowledge.

Every PID block may be a single PID, cascade, ratio or override controller, each providing the choice of analogue, time proportioned or valve position output.

When used as a cascade loop, the auto/manual function works on both loops allowing bumpless transfer between auto and manual while in cascade mode.

The control module in each rack is capable of running up to eight multiple, single or compound loops while operating at 9Hz (110 ms).

Override control allows for the implementation of advanced control strategies such as Auto profiling and thermal head control. This would allow the analogue input to set the maximum output that the loop can produce.

Advanced features include mathematical functions and combinational logic such as AND, OR, XOR, latch, equal, not equal, multiply, divide, high/low signal select, square root, greater than, less than, log, average, sample and hold etc.

Advanced functionality such as "hot swap" allows automatic switching to a back-up sensor if the primary input signal fails. Other functions include user value constants, timers with four modes of operation (pulse, off delay, minimum on and one shot), counters and totalisers.

The totaliser blocks can be used to measure the total quantity of a measurement integrated over time (e.g. flow, power). Outputs from the totaliser block are the inputs integrated value.

An alarm state and pulse output for wiring to a counter block or external electromechanical counter are available to extend the upper range of totalisation.

The soft wiring concept provides the ability to make a "connection" between a node inside the controller and an I/O signal such as a digital input or an analogue output.

For example, an analogue input signal can be "soft wired" to the maximum power output parameter on a control loop output.

A wide variety of I/O modules allows for any combination of analogue or digital I/O. Universal scalable and software selectable, dual, triple and quad analogue input modules accept thermocouple (J, K, T, L, N, R, S, B & P), RTD (Pt100, Cu10), loadcell, potentiometer, voltage, milliamp and millivolt inputs. Nonlinear or non standard curve inputs can also be up loaded.

A 24V dc auxiliary is available for loop powered inputs. Analogue outputs are software selectable between voltage and milliamp outputs, while multi-channel digital I/O (contact, logic and ac mains input [115/240V ac]) modules are provided for all pulse, switching, totalisation and alarming I/O requirements.

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