Siemens SIMATIC S7-1200 - 2 STEP 7 makes the work easy

Product overview
1.1 Introducing the S7-1200 PLC
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
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Table 1- 2 Blocks, timers, and counters supported by S7-1200
Element
Description
Blocks
Type
OB, FB, FC, DB
Size
CPU Model
CPU 1211C
CPU 1212C
CPU 1214C
CPU 1215C
CPU 1217C
Code blocks
50KB
64KB
64KB
64KB
64KB
Linked
1
data blocks 50KB 75KB 100KB 125KB 150KB
Unlinked
2
data blocks
256KB
256KB
256KB
256KB
256KB
Quantity
Up to 1024 blocks total (OBs + FBs + FCs + DBs)
Nesting depth 16 from the program cycle or startup OB;
6 from any interrupt event OB
Monitoring
Status of 2 code blocks can be monitored simultaneously
OBs
Program cycle
Multiple
Startup
Multiple
Time-delay interrupts
4 (1 per event)
Cyclic interrupts
4 (1 per event)
Hardware interrupts
50 (1 per event)
Time error interrupts
1
Diagnostic error interrupts
1
Pull or plug of modules
1
Rack or station failure
1
Time of day
Multiple
Status
1
Update
1
Profile
1
Timers
Type
IEC
Quantity Limited only by memory size
Storage
Structure in DB, 16 bytes per timer
Counters
Type
IEC
Quantity
Limited only by memory size
Storage Structure in DB, size dependent upon count type
• SInt, USInt: 3 bytes
• Int, UInt: 6 bytes
• DInt, UDInt: 12 bytes
1
Stored in work memory and load memory
2
Stored only in load memory