Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Instrukcja Użytkownika Pobierz pdf (Strona 71)

Chapter 5

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5-11

Important: For the 1771-DMC1 and -DMC4 modules, the default size

allows you to create 1024 TAGs; the -DMC module default size is zero.

Use the following sections to select the appropriate TAG function for your

application. See Appendix B, Application Program Interface Routines, for

the following information on these TAG functions: description, required

parameters, condition values, and a C program example.

TAGĆTable Configuration Functions

Use these TAG configuration functions to establish a TAG table for TAG

functions:

Table 5.I

TAGĆTable Configuration Functions

Function What It Does

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Read and Write Functions

Use these TAG functions to read and write to coprocessor memory:

Table 5.J

TAG Read and Write Functions

Function What It Does

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 %'& ' '#  ' !!#%+ % %'(%"& #" + '% ' ' & " % + 

Lock/Unlock Functions

Use the TAG_LOCK and TAG_UNLOCK functions as a pair in your

program. The TAG_LOCK function protects against concurrent access to

the tagged area of control-coprocessor memory. The TAG_UNLOCK

function is an unlock to the TAG locked by the TAG_LOCK function.

Important: Failure to use a TAG_UNLOCK function to complement a

TAG_LOCK function in a program may cause the system to hang-up.

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Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Instrukcja Użytkownika Strona 71