Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 169)

Technical data of CPU 31x
7.2 CPU 312
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
7-3
7.2 CPU 312
Technical data
Table 7-3 Technical data for the CPU 312
Technical data
CPU and version
Order number
6ES7312-1AD10-0AB0
• Hardware version 01
• Firmware version V2.0.0
• Associated programming package STEP 7 as of V 5.1 + SP 4
Memory
RAM
• Integrated 16 KB
• Expandable No
Load memory Plugged in with MMC (max. 4 MB)
Data storage life on the MMC
(following final programming)
At least 10 years
Buffering Guaranteed by MMC (maintenance-free)
Execution times
Processing times of
• Bit operations Min. 0.2 μs
• Word instructions Min. 0.4 μs
• Fixed-point arithmetic Min. 5 μs
• Floating-point arithmetic Min. 6 μs
Timers/counters and their retentivity
S7 counters
128
• Retentive memory Configurable
• Default from C0 to C7
• Counting range 0 to 999
IEC Counters Yes
• Type SFB
• Number unlimited (limited only by RAM size)
S7 timers 128
• Retentive memory Configurable
• Default Not retentive
• Timer range 10 ms to 9990 s
IEC Timers Yes
• Type SFB
• Number unlimited (limited only by RAM size)