PID Control Capability

The 2500 is now available with the 2500E IOC module. The Enhanced IOC is available in 4 or 8 single or compound advanced PID loops per base. Each PID function block consists of two PID functions. This creates a compound loop, which is capable of advanced control techniques such as cascade, ratio and override control. Override control is two complete PID loops that are connected to a single output. The output of the "loop" is selected from one of these two PID calculations. Override control allows for the implementation of advanced control strategies such as Auto profiling and thermal head control.

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

Toolkit Function Blocks

Toolkit blocks come in two types, analog and digital. Analog blocks provide mathematical computations such as multiply, divide, high/low signal select, square root, greater than, less than, ln, etc. Digital blocks perform logic functions such as AND, OR, XOR, latch, equal, not equal, etc. Toolkit blocks also provide advanced functionality such as "hot swap" which will switch to a back-up sensor if the primary input signal fails.

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New to V3.26 are double the number of User values (8 to 16), Analog operators (16 to 32) and Digital operators (16 to 32). Added are Timers and Totalizers.

Up to 8 Timer blocks have been added having 1 of 4 modes of operation; Pulse, Off delay, Minimum on and One shot. Up to 8 Totaliser blocks have been added that are used to measure the total quantity of a measurement integrated over time (e.g. flow, power). Outputs from the totalizer 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 totalization.

Digital Communications

The 2500 IOC variants V3.56 or greater support modbus/TCP (Ethernet), Modbus RTU, Profibus DP/DPv1 as a slave only device and DeviceNet as a Generic Device. V4.10, the Fast Sampling 2500 IOC supports Profibus DP/DPv1 as a slave only device.

New for V3.26 and greater: Support for 2400 to 38400 baud for Modbus RTU. Previous versions were limited to 19200 baud maximum; and, support in both the 4 and 8 loop IOC for Profibus DPv1.

Windows Based Configuration Software

The iTools Windows based configuration software is used to set up the PID blocks, set up the I/O, configure the Toolkit blocks and make "softwire" connections to the I/O points, the PID blocks or to internal variables.

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 analog output. For example, an analog input signal can be "soft wired" to the maximum power output parameter on a control loop output. This would allow the analog input to set the maximum output that the loop can produce.

V3.56 & V4.21 Now Available

New features in V3.56 are:

2500 Ethernet IOC

· IOC now available as a modbus/TCP (Ethernet) slave

· Up to 4 simultaneous masters -- This allows for example a PC running SCADA, local display panel and iTools to communicate to the 2500 at the same time.

· 10baseT (2 - RJ45) field communications

· Ability to obtain IP address from DHCP server -- This is selectable by a configuration parameter called “DHCP Enable”

· Preferred master connection -- Ensures that a connection is always available for the preferred master

Other New Features

· New Security Features -- The IOC features are now controlled by an encrypted passcode in a manner similar to the 26/2704 instrument. The iTools server has been updated to handle the new 2500 algorithm and will accept email requests for 2500 upgrades in the same way as 26/2704. This feature is supported by iTools V4.21. ·

· Ramp to working SP Feature -- This provides the ability to start a SP ramp from the working setpoint. Previously all SP ramps servo’d to the PV

The 2500 IOC V3.56 supports modbus/TCP (Ethernet), Modbus RTU, Profibus DP/DPv1 and DeviceNet (Group 2 only server) variants and has available coding functions ACQIO, UW, 4LOOP, 4LOOPUW, 8LOOP and 8LOOPUW.

The 2500 IOC V4.21 supports Profibus DP/DPv1 and has the SYSIO coding IOC function only (Fast Sampling IOC).