Basic instructions
8.8 Program control operations
S7-1200 Programmable controller
314 System Manual, V4.2, 09/2016, A5E02486680-AK
The ErrorStruct data type used by the GET_ERROR instruction can be added in the data
block editor and block interface editors, so your program logic can access these values.
Select ErrorStruct from the data type drop-down list to add this structure. You can create
multiple ErrorStruct elements by using unique names. The members of an ErrorStruct cannot
be renamed.
Error condition indicated by ENO
If EN = TRUE and GET_ERROR or GET_ERROR_ID executes, then:
● ENO = TRUE indicates a code block execution error occurred and error data is present
● ENO = FALSE indicates no code block execution error occurred
You can connect error reaction program logic to ENO which activates after an error occurs. If
an error exists, then the output parameter stores the error data where your program has
access to it.
GET_ERROR and GET_ERROR_ID can be used to send error information from the currently
executing block (called block) to a calling block. Place the instruction in the last network of
the called block program to report the final execution status of the called block.
RUNTIME (Measure program runtime)
Table 8- 150 RUNTIME instruction
_lread_inout_);
Measures the runtime of the entire program, individual blocks, or
command sequences.
If you want to measure the runtime of your entire program, call the instruction "Measure
program runtime" in OB 1. Measurement of the runtime is started with the first call and the
output RET_VAL returns the runtime of the program after the second call. The measured
runtime includes all CPU processes that can occur during the program execution, for
example, interruptions caused by higher-level events or communication. The instruction
"Measure program runtime" reads an internal counter of the CPU and write the value to the
IN-OUT parameter MEM. The instruction calculates the current program runtime according
to the internal counter frequency and writes it to output RET_VAL.
If you want to measure the runtime of individual blocks or individual command sequences,
you need three separate networks. Call the instruction "Measure program runtime" in an
individual network within your program. You set the starting point of the runtime
measurement with this first call of the instruction. Then you call the required program block
or the command sequence in the next network. In another network, call the "Measure
program runtime" instruction a second time and assign the same memory to the IN-OUT
parameter MEM as you did during the first call of the instruction. The "Measure program
runtime" instruction in the third network reads an internal CPU counter and calculates the
current runtime of the program block or the command sequence according to the internal
counter frequency and writes it to the output RET_VAL.
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