Siemens SIMATIC S5 Operating Instructions

Principle of operation
The PU 631 is equipped with a program
memory (PU-memory) with a capacity of
4K
statements. The built-in backup battery
retains the program for a period of 30
minutes after the
PU has been switched'
off. In the on-line mode of operation a
PC S5-130
may work either with its own
EPROM-memory or with the PU-memory.
The PC
~5-110~/ 010 can only work with
the PU-memory in the on-line
mode.
To prevent malfunctions of the controller
during on-line operation (PC with PU-memory)
only complete networks (or basic software
modules in the case of
STL) may be trans-
ferred to the PU-memory during program in-
putting or alteration. This
is achieved
in the PU 631 with an intermediate buffer
storage.
A network element or statement which was
inputted, appears initially in the input
field of the screen. After depressing keys
or
, the statement is trans-
ferred to the intermediate buffer.
After a completed input or alteration of a
network, the contents of the
intermediate.
buffer must be transferred to the PU-memory
by pressing key
.
Note:
During off-line operation the transfer from
the intermediate buffer to the PU-memory
is
done automatically as soon as the inter-
mediate buffer
is full. Hence key m needs
only to be depressed at the end of program
inputting.

Siemens SIMATIC S5 Specifications

General

Product type designation	SIMATIC S5
Programming language	STEP 5
Digital inputs	Varies by model
Digital outputs	Varies by model
Analog inputs	Varies by model
Analog outputs	Varies by model
Supply voltage	24V DC
CPU Type	Varies by model
Memory	Varies by model
Digital I/O	Varies by model
Analog I/O	Varies by model
Communication	PROFIBUS
Operating Temperature	0°C to 60°C
Relative Humidity	5% to 95% (non-condensing)