Siemens CP 1542SP-1 - Process Image, Types of Transmission, Event Classes, Triggers

Configuration and operation
4.5 Telecontrol communication (CP 1542SP-1 IRC)
CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1
Operating Instructions, 01/2017, C79000-G8976-C426-03
63
Format (memory
requirements)
Data point type
IEC type
Direction
S7 data types
Operand area
Integer (32 bits)
Bitstring of 32 bits
<7>
in
UDInt, DWord
I, Q, M, DB
Bitstring of 32 bits with time tag
CP56Time2a
1)
<33> in UDInt, DWord I, Q, M, DB
Integrated totals
<15>
in
UDInt, DWord
I, Q, M, DB
Integrated totals with time tag
CP56Time2a
1)
<37> in UDInt, DWord I, Q, M, DB
Bitstring of 32 bits
<51>
out
UDInt, DWord
Q, M, DB
Floating-point
number (32 bits)
Measured value, short floating point
number
<13> in Real Q, M, DB
Measured value, short floating point
number with time tag CP56Time2a
1)
<36> in Real Q, M, DB
Set point command, short floating
point number
<50> out Real Q, M, DB
Block of data
(1...2 Bit)
2)
Double-point information
<3>
in
2)
DB
Double-point information with time
tag CP56Time2a
1)
<31> in
2)
DB
Double command
<46>
out
2)
DB
Regulating step command
<47>
out
2)
DB
Block of data
(1...32 Bit)
3)
Bitstring of 32 bits
3)
<7>
in
3)
DB
Bitstring of 32 bits with time tag
CP56Time2a
1) 3)
<33> in
3)
DB
Bitstring of 32 bits
3)
<51>
out
3)
DB
1)
For the format of the time stamp, see the following section.
2)
For these data point types, create a data block with an array of precisely 2 bool.
3)
With these data point types, contiguous memory areas up to a size of 32 bits can be transferred. Only the S7 Bool data
type is compatible.
Time stamp with the IEC CP
IEC CP time stamps are transferred according to the IEC specification in the "CP56Time2a"
format. Note that in the frames only the first 3 bytes for milliseconds and minutes are
transferred.
4.5.7.3
Process image, types of transmission, event classes, triggers
Saving the data point values
The values of data points are stored in the image memory of the CP and transferred only
when queried by the communications partner.
Events are also stored in the send buffer and can be transferred unsolicited.