Siemens S5-135U/155U appendix Interface SI2, Interface Submodules

CPUs, Memory Cards, Memory Submodules, Interface Submodules

5.2.3Interfaces of the CPU 948

This section contains information on the interfaces of the CPU 948.

PG Interface SI1	You can use the PG interface on the CPU 948 either via the front connector
	or via the 923C coordinator module and the S5 bus.
	Note
	Simultaneous operation of the PG interface via the front connector of the
	CPU 948 and via the 923C coordinator is not possible. Switching the PG
	online without a job request is already sufficient to operate the interface.
	Electrically, it is merely a PG interface which can be operated via two
	different terminals.
	The connection to the PG can be established in every operational state of the
	CPU.
Interface SI2	You can also use the second interface of the CPU 948 as a PG interface.
	Physical adaptation is achieved with a PG module (see also Section 5.9,
	Interface Submodules).
	A detailed description of PG interfaces can be found in the CPU 948
	Programming Guide.

Communication A PG-PLC link via SINEC H1 allows very advanced communication

via Parallelbetween the partners. For example, the user software can be loaded into the

Backplane Bus CPU 948 up to eight-times faster than with serial communication.

with SINEC H1

For this link you will need, in addition to the CPU 948, a CPU 143 (Version

w2.1) in the PLC and a PG7xx with SINEC H1 connection and the STEP 5 single-tasking software from Version 6.0 or multi-tasking from Version 2.0.

Note

You cannot implement communication via SINEC H1 in parallel with the serial interfaces.

Communication via SINEC H1 is described in detail in the CPU 948

Programming Guide.

System Manual	5-27
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