Basic instructions
8.3 Counter operations
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
249
If the FB does not specify "Optimized block access", then the block access type is standard,
which is compatible with S7-300/400 classic configurations and allows symbolic and direct
access. To assign a multi-instance to a standard block access FB, follow these steps:
1. Open the FB for edit.
2. Place the counter instruction at the desired location in the FB.
3. When the Call options dialog appears, click on the multi instance icon. The multi instance
option is only available if the instruction is being placed into an FB.
4. In the Call options dialog, rename the counter if desired.
5. Click OK. The counter instruction appears in the editor with type INT for the preset and
count value, and the IEC_COUNTER structure appears in the FB Interface under Static.
6. If desired, change the type in the counter instruction from INT to one of the other types.
The counter structure will change correspondingly.
7. Open the block that will use this FB.
8. Place this FB at the desired location. Doing so results in the creation of an instance data
block for this FB.
9. Open the instance data block created when you placed the FB in the editor.
10.Under Static, locate the counter structure of interest. In the Retain column for this counter
structure, check the box to make this structure retentive.
Type shown in counter instruction (for preset
and count values)
Corresponding structure Type s
hown in FB
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