Siemens Simatic S7-400

CPUs of the S7-400
2-6
Automation System S7-400 Configuration and Use
A5E0044271 1-02
2.2 Performance Characteristics of the CPUs
Introduction
This chapter compares the performance characteristics of the S7-400 and
S7-400H CPUs.
Table 2-2 Performance Characteristics of the S7-400 CPUs
CPU 412-1 412-2 414-2 414-3 416-2
416-2F
416-3 417-4
User memory
• integrated
• for program
• for data
144 KB
72 KB
72 KB
256 KB
128 KB
128 KB
512 KB
256 KB
256 KB
1.4 MB
700 KB
700 KB
2.8 MB
1.4 MB
1.4 MB
5.6 MB
2.8 MB
2.8 MB
20 MB
10 MB
10 MB
Loading memory
• integrated
• expandable to
256 KB RAM
64 MB
Buffering Yes
Number of blocks
• FC
• FB
• DB
DB0 reserved
256
256
511
2048
2048
4095
6144
6144
8191
Program execution
• Free cycle
• Time interrupts
• Delay interrupts
• Watchdog interrupts
• Hardware interrupts
• Multicomputing
interrupts
• Clock synchronization
interrupts
• Startup
1
2
2
2
2
1
4
3
1
4
4
4
4
1
4
3
1
8
4
9
8
1
4
3
1
8
4
9
8
1
4
3
Execution times
• Bit operations
• Word operations
• Fixed-point arithmetic
• Floating-point
arithmetic
0.1 µs
0.1 µs
0.1 µs
0.3 µs
0.06 µs
0.06 µs
0.06 µs
0.18 µs
0.04 µs
0.04 µs
0.04 µs
0.12 µs
0.03 µs
0.03 µs
0.03 µs
0.09 µs
Memory bits, timers,
counters
• Memory bits
• S7 timers / S7
counters
• IEC timers / IEC
counters
4KB
2048/2048
SFB/SFB
8KB
2048/2048
SFB/SFB
16 KB
2048/2048
SFB/SFB