Siemens Simatic S7-300 Technical Data Manual page 19

Mode selector switch
Use the mode selector switch to set the CPU operating mode.
Table 2-1
Position
RUN
STOP
MRES
Reference
• CPU operating modes:
• Information on CPU memory reset:
• Evaluation of the LEDs upon error or diagnostic event:
Power supply connection
Each CPU is equipped with a double-pole power supply socket. The connector with screw
terminals is inserted into this socket when the CPU is delivered.
Differences between the CPUs
Table 2-2
Element
9-pole DP
interface (X2)
15-pole PtP
interface (X2)
Digital inputs
Digital outputs
Analog inputs
Analog outputs –
Technological
functions
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
Positions of the mode selector switch
Meaning
RUN mode
STOP mode
CPU memory
reset
Commissioning, Commissioning Modules, CPU Memory Reset by means of Mode
Selector Switch
and CPU 31x, Test Functions, Diagnostics and Troubleshooting, Diagnostics with the
help of Status and Error LEDs
Differences of the CPUs 31xC
CPU
312C
–
–
10
6
–
2 counters
2.1 Operating and display elements: CPU 31xC
Description
The CPU executes the user program.
The CPU does not execute a user program.
Mode selector switch position with pushbutton function for CPU
memory reset. A CPU memory reset by means of mode selector
switch requires a specific sequence of operation.
STEP 7 Online Help
.
Operating instructions CPU 31xC and CPU31x,
CPU CPU
313C
313C-2 DP
– X
– –
24 16
16 16
4 + 1 –
2 –
3 counters 3 counters
Operating and display elements
Operating Instructions CPU 31xC
CPU CPU
313C-2 PtP 314C-2 DP
– X
X –
16 24
16 16
– 4 + 1
– 2
3 counters 4 counters
1 channel for
positioning
CPU
314C-2 PtP
–
X
24
16
4 + 1
2
4 counters
1 channel
for
positioning
2-3