Siemens SIMATIC NET S7-1200 Operating Instructions Manual page 37

To allow the value resulting from local events or interventions to be transferred to the master,
the data point in question requires a channel for mirroring back.
This mirroring back function is enabled using the "Value monitoring (Reporting Changes)"
option in the STEP 7 configuration, refer to the section "General" parameter group
(Page 50).
Remember that to use the mirror back function, you need to interconnect the local values in
the controller with the relevant PLC tag of the data point.
Time stamp of the DNP3 CP in UTC format
Time stamps are transferred in UTC format (48 bits) and contain milliseconds since
01.01.1970.
CP 1243-1 IEC: Supported data point types
Table 5- 2 Supported data point types, IEC types and compatible S7 data types
Format (memory Data point type
requirements)
Bit Single point information
Single point information with time tag
1)
Single command
Byte Step position information
Step position information with time
tag
Regulating step command
Integer (16 bits) Measured value, normalized value
Measured value, normalized value
with time tag
Measured value, scaled value
Measured value, scaled value with
time tag
Set point command, normalised
value
Set point command, scaled value
Integer (32 bits) Bitstring of 32 bits
Bitstring of 32 bits with time tag
Integrated totals
Integrated totals with time tag
CP 1243-1 DNP3, CP 1243-1 IEC
Operating Instructions, 02/2014, C79000-G8976-C312-02
1)
1)
1)
IEC type Direction
<1>
<30>
<45>
<5>
<32>
<47>
<9>
<34>
<11>
<35>
<48>
<49>
<7>
<33>
1)
<15>
<37>
1)
Configuration and operation
S7 data types
in BOOL
in BOOL
out BOOL
in BYTE
in BYTE
out BYTE
in INT
in INT
in INT
in INT
out INT
out INT
in DWORD,
UDINT
in DWORD,
UDINT
in DWORD,
UDINT
in DWORD,
UDINT
5.5 Datapoint types
Address area
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
I, Q, M, DB
37