240 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Appendix F MicroLogix 1400 Distributed Network Protocol
Descriptor Code: NONE, NAME, DAEL, PTYP
Data Type Code: NONE, VSTR, UINT, INT, FLT, OSTR, BSTR, TIME
Max Data Length (bytes): 0…255
Ancillary Value: Any string. This can be a binary array or ASCII string, up to
16 words.
Point Addressing under Descriptor Element Configuration: Data-Set value for
each Data-Set element is configured by:
• Point Address Type
•Point Type
•Point Index
• File Number
• File Element
• File Sub Element.
When these values are configured properly according to the supported data
files, the controller responds with a g87v1 object filled with the value in the data
file. Table 28 on page 240
shows the supported data files for the Point
Addressing.
Table 28 - Point Address Type — Standard DNP3 Point
Point Address Type Data Type Code
Maximum Data Length
(bytes)
Point Type Point Index Low Byte Point Index High Byte
Standard DNP3 Point
NONE = 0 0
NONE = 0:
No point type is associated.
0
NONE = 0
UINT = 2
INT = 3
OSTR = 5
BSTR = 6
TIME = 7
0
0, 1, 2, or 4
0, 1, 2, or 4
0…255
0…255
0…6
BI= 1: Binary input
0…4095 max
When the Data Types other than OSTR and BSTR are used, the Point Index
must be set to a point offset that is divisible by 16.
B2I= 3:
Double-bit input
0…2047 max
When the Data Types other than OSTR and BSTR are used, the Point Index
must be set to a point offset that is divisible by 8.
CI= 20:
Counter
0…511 max
AI= 30:
Analog input
0…767 max
BCD= 101:
BCD point
0…255 max
Table 29 - Point Address Type — MicroLogix Data File
Point Address Type Data Type Code
Maximum Data Length
(bytes)
File Number File Element File Sub-Element
MicroLogix Data File
NONE = 0 0 0 0 0
VSTR = 1 0…82 9…255 (ST) 9…255 0…40
UINT = 2 0, 1, 2, or 4
2(S)
3, 9…255 (B)
7, 9…255 (N)
9…255 (L)
0…65 for S
0…255 for B, N, L
0 for S, N, L
0…15 for B
INT = 3 0, 1, 2, or 4
2(S)
3, 9…255 (B)
7, 9…255 (N)
9…255 (L)
0…65 for S
0…255 for B, N, L
0 for S, N, L
0…15 for B
FLT = 4 0 or 4 8, 9…255 (F) 0…255 0
OSTR = 5 0…255
2(S)
3, 9…255 (B)
7, 9…255 (N)
0…65 for S
0…255 for B, N,
0 for S, N
0…15 for B
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