Industrial communication networks. Fieldbus specifications - Application layer protocol specification. Type 21 elements not-eligible It’s for use by swimming

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Industrial communication networks. Fieldbus specifications - Application layer protocol specification. Type 21 elements not-eligible It’s for use by swimmingWhat is BS EN 61158 6 21 Type 21 application layer about? The Fieldbus Application Layer (FAL) provides user programs with a means to access the Fieldbus communication environment. In this respect, the FAL can be considered a window between corresponding application programs. BS EN 61158 6 21 part of IEC 61158 provides the common elements for basic time critical and non time critical messaging communications between application programs in an