功能块是实现现场智能仪表互操作、自诊断和自适应功能的基础。为了形式化地分析和模拟功能块及其构成的控制系统 ,本文建立了功能块的着色Petri网 (CPN)模型。文中不但利用CPN模型分析了单一功能块内部的模式转换和参数状态传播过程 ,并且分析了功能块构成控制系统中的不同功能块的模式和参数状态之间的相互关系。基于功能块的锅炉水位控制系统应用过程的建模与分析表明 ,CPN模型完全胜任上述要求。 Function blocks are the basis for interoperability, self-diagnosis and self-adaptation of on-site smart meters. In order to formally analyze and simulate the function block and its control system, this paper establishes a colored Petri Net (CPN) model of the function block. In this paper, not only the mode conversion and parameter state propagation within a single function block are analyzed by CPN model, but also the relationship between the modes and parameter states of different function blocks in the control system is analyzed. The modeling and analysis of the application process of boiler water level control system based on function block show that the CPN model is fully qualified for the above requirements.