Rockwell Automation Publication 1756-PM020F-EN-P - January 2019 69
The values for BOOL 0 and 1 returned by the controller are 0x00 and 0xFF
respectively.
Message Request Field Bytes (in hex) Description - Symbolic Segment Addressing
Request Service 4C Read Tag Service (Request)
Request Path Size 0A Request Path is 10 words (20 bytes) long
Request Path 91 07 73 74 72 75 63 74 32 00
91 08 70 69 6C 6F 74 5F 6F 6E
Symbolic Segment for struct2
Symbolic Segment for pilot_on
Request Data 01 00 Number of elements to read (1)
Message Reply Field Bytes (in hex) Description - Symbolic Segment Addressing
Reply Service CC Read Tag Service (Reply)
Reserved 00
General Status 00 Success
Extended Status Size 00 No extended status
Reply Data C1 00 BOOL Tag Type Value
FF BOOL value for 1
See also
Atomic Members of Predefined Data Types on page 63
This topic shows examples of accessing simple structures to help illustrate
the message formats needed. The examples all use the Symbolic Segment
Addressing method. The four structure examples are defined and various
members of the structures are accessed in the examples that follow.
Structure Name: STRUCT_A
Structure Name: STRUCT_B
Member Data Type
Member Data Type
limit4 BOOL
pilot_on BOOL
limit7 BOOL
hourlyCount INT [12]
travel DINT
rate REAL
errors SINT
wear REAL
Structure Name: STRUCT_C
Structure Name: STRUCT_D
Member Data Type
Member Data Type
hours_full BOOL
myint INT
today STRUCT_B
myfloat REAL
sampleTime DINT
myarray STRUCT_C[8]
shipped DINT
mypid REAL
Structures
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