User Manual

Introducing the powerful and flexible S7-1200
1.1 Introducing the S7-1200 PLC
Easy Book
Manual, 03/2014, A5E02486774-AF
17
Table 1- 2 Blocks, timers, and counters supported by S7-1200
Element
Description
Blocks
Type
OB, FB, FC, DB
Size 30 Kbytes (CPU 1211C)
50 Kbytes (CPU 1212C)
64 Kbytes (CPU 1214C, CPU 1215C, and CPU 1217C)
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