Differences Between Cpu 3182 And Cpus 312 Ifm To 3162 Dp - Siemens SIMATIC S7-300 Series Reference Manual

CPU Function, depending on CPU and STEP 7 Version
4.1

Differences between CPU 3182 and CPUs 312 IFM to 3162 DP

4 rechargeable batteries for 318-2
The following table shows you what to watch for if you want to use an STL user
program of a CPU 312IFM to a CPU 316-2DP for the CPU 318-2.
Instructions
Double integer math
(+I, –I, *I, /I;
+D, –D, *D, /D,MOD;
+R, –R, *R, /R)
Configuration
From 312 IFM to 316-2 DP CPUs, the CPU 318-2 "imports" only projects created
with STEP 7 V 5.x.
You cannot operate programs containing FM or CP (SDB 1xxx) configuration data
(e.g. FM 353/354) in a CPU 318-2!
In this case, the respective project needs to be edited accordingly or recreated.
Starting a Timer in the User Program
The accumulator register in CPU 318–2 must contain a number in BCD format
when starting a timer in your user program (e.g. with SI T).
Force
The differences of force operations are described in Chapter 1.3.1.
Loading the User Program to the Memory Card
... using the PD function Load User
Program
4-2
CPU 318-2
4 accumulators
User Program from the CPU 312IFM to 316-2DP for the
The CPU 318 transfers the contents of accumulators 3 and 4
to accumulators 2 and 3 after these operations.
If accumulator 2 is evaluated in the (accepted) user program,
you now receive incorrect values with the CPU 318-2
because the value has been overwritten by the contents of
accumulator 3.
CPU 318-2
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
CPUs 312IFM to 316-2DP
2 accumulators
CPU 318
CPUs 312IFM to 316-2DP
... using the PD function Copy RAM To
ROM or Load User Program
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