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A modifier function block adapted for use in process control routine includes a series of processor implementable instructions that conditionally enhance or modify the functionality of a base function block associated with the process control routine. The base function block includes a resettable br

A modifier function block adapted for use in process control routine includes a series of processor implementable instructions that conditionally enhance or modify the functionality of a base function block associated with the process control routine. The base function block includes a resettable branching point located within a set instructions used to perform a process control related operation. The branching point of the base function block has a pointer which, when set to a first value, causes another of the set of instructions within the base function block to be executed (to thereby bypass the execution of the modifier function block), and which, when set to a second value, causes the series of instructions within the modifier function block to be executed (to thereby alter the functionality of the base function block). In this manner, the modifier function block may be conditionally called, depending on the state of the base function block, to change the operation of the base function block or to, alternatively, leave the functionality of the base function block unaltered.

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A modifier function block adapted for use in process control routine includes a series of processor implementable instructions that conditionally enhance or modify the functionality of a base function block associated with the process control routine. The base function block includes a resettable br

A modifier function block adapted for use in process control routine includes a series of processor implementable instructions that conditionally enhance or modify the functionality of a base function block associated with the process control routine. The base function block includes a resettable branching point located within a set instructions used to perform a process control related operation. The branching point of the base function block has a pointer which, when set to a first value, causes another of the set of instructions within the base function block to be executed (to thereby bypass the execution of the modifier function block), and which, when set to a second value, causes the series of instructions within the modifier function block to be executed (to thereby alter the functionality of the base function block). In this manner, the modifier function block may be conditionally called, depending on the state of the base function block, to change the operation of the base function block or to, alternatively, leave the functionality of the base function block unaltered. ally controllable spectral profile," Optics Letters, vol. 22, No. 19, pp. 1476-1478 (Oct. 1, 1997). H.S. Kim, et al., "Actively gain-flattened erbium-doped fiber amplifier over 35nm using all-fiber acoustrooptic tunable filters," IEEE Photonics Technology Letters, vol. 10, No. 6, pp. 790-792 (Jun. 1998). S.H. Yun, et al., "Dynamic Erbium-Doped Amplifier Based on Active Gain Flattening with Fiber Acoustoopic Tunable Filters," IEEE Photonics Technology Letters, vol. 11, No. 10, pp. 1229-1231 (Oct. 1999). S.H. Yun, et al., "All-Fiber Acousto-Optic Tunable Filter," OFC '95, San Diego, California, pp. 186-187 (Feb. 26-Mar. 3, 1995). S.H. Yun, et al., "Electronically Tunable Fiber Laser Using All-Fiber Acousto-Optic Tunable Filter," IOOC '95, (10th International Conference on Integrateel Optics and Optical Fibre Communication), Hong Kong, pp. 22-23 (Jun. 26-30, 1995). B.Y. Kim, "Acousto-Optic Components for WDM Application," IEEE/LEOS Summer Topical Meetings, San Diego, California, USA, pp. 47-48, Invited Papers (Jul. 26-28, 1999). T.E. Dimmick, et al., "Narrow-band acousto-optic tunable filter