Table of contents 
CPU 31xC and CPU 31x, Technical data 
Manual, Edition 08/2004, A5E00105475-05 
xi 
Table 4-1  Retentivity of the RAM ............................................................................................................... 4-2 
Table 4-2  Retentive behavior of memory objects (applies to all CPUs with DP/MPI-SS (31x-2 PN/DP) .. 4-3 
Table 4-3  Retentive behavior of DBs for CPUs with firmware >= V2.1.0 .................................................. 4-4 
Table 4-4  Address areas of system memory ............................................................................................. 4-5 
Table 5-1  Cyclic program processing......................................................................................................... 5-3 
Table 5-2  Formula for calculating the process image (PI) transfer time .................................................... 5-5 
Table 5-3  CPU 31xC: Data for calculating the process image (PI) transfer time....................................... 5-5 
Table 5-4  CPU 31x: Data for calculating the process image (PI) transfer time ......................................... 5-6 
Table 5-5  Extending the user program processing time ............................................................................ 5-6 
Table 5-6  Operating system processing time at the scan cycle checkpoint .............................................. 5-7 
Table 5-7  Extended cycle time due to nested interrupts............................................................................ 5-7 
Table 5-8  Cycle time extension as a result of errors.................................................................................. 5-8 
Table 5-9  Cycle time extension as a result of testing and commissioning functions............................... 5-11 
Table 5-10  Formula: Shortest response time............................................................................................. 5-16 
Table 5-11  Formula: Longest response time ............................................................................................. 5-18 
Table 5-12  Calculating the response time.................................................................................................. 5-20 
Table 5-13  Process/diagnostic interrupt response times ........................................................................... 5-21 
Table 5-14  Process/diagnostic interrupt response times ........................................................................... 5-22 
Table 6-1  Available MMCs ......................................................................................................................... 6-2 
Table 6-2  Maximum number of loadable blocks on the MMC.................................................................... 6-2 
Table 6-3  Technical data of CPU 312C ..................................................................................................... 6-3 
Table 6-4  Technical data of CPU 313C ..................................................................................................... 6-8 
Table 6-5  Technical data for CPU 313C-2 PtP/ CPU 313C-2 DP............................................................ 6-14 
Table 6-6  Technical data of CPU 314C-2 PtP and CPU 314C-2 DP....................................................... 6-21 
Table 6-7  Parameters of standard DI.......................................................................................................6-39 
Table 6-8  Parameters of the interrupt inputs............................................................................................ 6-39 
Table 6-9  Parameters of standard AI .......................................................................................................6-41 
Table 6-10  Parameters of standard AO ..................................................................................................... 6-42 
Table 6-11  Start information for OB40, relating to the interrupt inputs of the integrated I/O ..................... 6-45 
Table 6-12  Technical data of digital inputs................................................................................................. 6-47 
Table 6-13  Technical data of digital outputs .............................................................................................. 6-49 
Table 6-14  Technical data of analog inputs ............................................................................................... 6-51 
Table 6-15  Technical data of analog outputs............................................................................................. 6-53