Configuration
4.18 Data points
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
139
The local values of these two object groups can be monitored for changes and the changes
transferred to the master. A change to a local value can be caused by, for example, manual
operator input on site.
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. You configure this mirroring
back function using the "Value monitoring" option in data point configuration, "General" tab.
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.
Format of the time stamp
Time stamps are transferred in UTC format (48 bits) and contain milliseconds.
Data point types of the "IEC" protocol
The "Direction" column shows the transmission direction:
●
"in / input": Monitoring direction
●
"out / output": Control direction
Table 4- 4
Supported data point types, IEC types and compatible S7 data types
Format (memory
requirements)
Data point type
IEC type
Direction S7 data types
Operand area
Bit
Single-point information
<1>
in
Bool
I, Q, M, DB
Single-point information with time tag
CP56Time2a
1)
<30>
in
Bool
I, Q, M, DB
Single command
<45>
out
Bool
Q, M, DB
Single command with time tag
CP56Time2a
1)
<58>
out
Bool
Q, M, DB
Byte
Step position information
<5>
in
Byte, USInt
I, Q, M, DB
Step position information with time
tag CP56Time2a
1)
<32>
in
Byte, USInt
I, Q, M, DB
Integer (16 bits)
Measured value, normalized value
<9>
in
Int
I, Q, M, DB
Measured value, normalized value
with time tag CP56Time2a
1)
<34>
in
Int
I, Q, M, DB
Measured value, scaled value
<11>
in
Int
I, Q, M, DB
Measured value, scaled value with
time tag CP56Time2a
1)
<35>
in
Int
I, Q, M, DB
Set point command, normalised
value
<48>
out
Int
Q, M, DB
Set point command, scaled value
<49>
out
Int
Q, M, DB
Set point command, normalised
value with time tag CP56Time2a
1)
<61>
out
Int
Q, M, DB
Set point command, scaled value
with time tag CP56Time2a
1)
<62>
out
Int
Q, M, DB
