Siemens Memory Specifications download pdf (Page 18)

2 S7-1200/1500 Innovations

2.8 New data types for S7-1200/1500

Programming Guideline for S7-1200/1500

V1.2, Entry ID: 81318674



Table 2-9: Floating-point decimal data types

Type Size Value range

Real 32 bit (1 bit signs, 8 bit exponent, 23 bit mantissa),

accurate to 7 decimal places

-3.40e+38 .. 3.40e+38

LReal 64 bit (1 bit signs, 11 bit exponent, 52 bit

mantissa), accurate to 15 decimal places

-1.79e+308 .. 1.79e+308

2.8.2 Date_Time_Long data type

Table 2-10: Structure of DTL (Date_Time_Long)

Year Month Day Weekday Hour Minute Second Nanosecond

DTL always reads the current system time. Access to the individual values is

through the symbolic names (e.g. My_Timestamp.Hour)

Advantages

 All partial areas (e.g. Year, Month, …) can be addressed symbolically.

Recommendation

Use the new DTL data type instead of LDT and address symbolically (e.g.

My_Timestamp.Hour).

Note

You will find further information in the following entries:

In STEP 7 (TIA Portal), how can you input, read out and edit the date and time

for the CPU modules of S7-300/S7-400/S7-1200/S7-1500?

http://support.automation.siemens.com/WW/view/en/58387452

Which functions are available in STEP 7 V5.5 and in TIA Portal for processing

the data types DT and DTL?

http://support.automation.siemens.com/WW/view/en/63900230

2.8.3 VARIANT data type

A parameter of the VARIANT type is a pointer that can point to tags of different

data types. In contrast to the ANY pointer the VARIANT is a pointer with type test.

The target structure and source structure are checked at runtime and have to be

identical.

VARIANT is used, for example, as input for communication blocks (TSEND_C).

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Siemens Memory Specifications Page 18