2 PROFINET IO in SIPROTEC
2.3 Data-Type Definitions for IO Data Exchange
25SIPROTEC 4, Communication Module PROFINET IO, Communication Profile
C53000-L1840-C360-1, Edition 08.2012
2.3.5 Metered Values
Number of byte values: 4 (32 bits)
Range of values: 0 to +4 294 967 295
Figure 2-9 Data Type: Metered Value
Status Bit (S)
The metered value with set status bit (S) is invalid for the following reasons:
• Invalid metered value after initial start/restart of the device
(status bit is deleted after 2 restoring intervals of the metered value following initial start/restart)
• The external error bit for pulse metered values for the binary input is set.
To convert the 32-bit pulse metered value into an energy value in floating-point format, conversion factors can
be determined via acyclic read accesses.
See Chapter 2.4, IO module counters 04 in this context.
S
1 bit 31 bits
Byte 0 (LSB)
Metered value
Byte 3 (MSB) Byte 2 Byte 1
... ...
NOTE
• The metered value in the SIPROTEC device overflows when 7FFFFFFFH + 1 to 0.
• Transmission of the status bit can be disabled in application cases where transmission of the metered
value status bit is not desired or where it could lead to erroneous interpretations during analysis in the IO
controller. In these cases, the status bit always assumes the value 0.
See also Figure 2-16 in this context.
com_profinet-io_profile_us.book Page 25 Friday, August 17, 2012 1:40 PM
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