Siemens 928B User guide

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5.4 CPU 928B

This section contains the hardware description and technical specifications of

the CPU 928B.

Details on programming the CPU 928B can be found in the

CPU 928B Programming Guide.

5.4.1 Technical Description

You can use the CPU 928B in single and multiprocessor operation in the

S5-135U/155U central controller (see Chapter 6). Up to four CPUs can be

used.

The CPU 928B is universally applicable, ensuring both very fast

bit processing and very fast word processing:

Cyclic

Time-controlled (9 different timebases)

Real-time controlled

Interrupt-driven (hardware interrupt)

Delayed (from Version 6ES5 928-3UB12)

The programming language is STEP 5.

The electronic circuitry of the CPU 928B is on two PCBs (basic and

expansion boards) in the double Eurocard format. Both PCBs are screwed

together, linked via connectors, and must not be separated. The basic board

provides the connection to the S5 bus via two backplane connectors.

The front plate width is 2 2/3 standard plug-in stations.

Application

Design

CPUs, Memor

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Submodules, Interface Submodules

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You require a user memory submodule (RAM or EPROM) for storage of your

program. You can store up to 64 x 210 bytes of code and data blocks here. For

data blocks, the CPU 928B additionally has an integrated DB RAM of

46 x 210 bytes.

A description of the memory submodules can be found in Sections 5.9 and

5.10; order numbers are given in the ordering information.

There are two independent interfaces on the front of the CPU 928B.

You can connect programmers and OPs to the first interface. This

PG interface SI1 is permanently installed on the CPU.

You can use PG interface SI1 either via the front connector of the CPU 928B

or via the front connector of the 923C coordinator module.

Note

Simultaneous operation of PG interface SI1 via the front connector of the

CPU 928B and of the coordinator is not possible. Electrically, it is merely a

PG interface which can be operated via two different terminals. Switching

the programmer online without a job request is already sufficient to operate

the interface. If you wish to utilize a second PG interface for connection of a

PG or OP, the connection must be made via the second PG interface with the

PG submodule.

Apart from PG interface SI1, the second interface SI2 can also be used as a

PG interface in parallel with the first one. You can only use the second

PG interface via the front connector of the PG submodule on the CPU 928B.

A detailed description of operations with the two PG interfaces can be found

in the CPU 928B Programming Guide.

The connection to the PG can be established with the CPU in any operational

state.

User Memory

PG Interface SI1

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You can optionally use the second interface of the CPU 928B as:

A PG interface (for PG and operator panels)

Interface for the RK 512 computer link

Interface for data transmission with procedures 3964/3964R

Interface for data transmission with the “open driver”

Interface for data transmission via the SINEC L1 bus (from

Version 6ES5 928-3UB12).

To utilize the second interface as the PG interface, you need the

PG submodule.

You need one of the following interface submodules for the

RK 512 computer link, for data transmission with procedures 3964/3964R

and for data transmission with the “open driver”:

V.24 submodule (RS 232C)

TTY submodule

RS422 A/485 submodule (only in the RS422 A module).

To utilize the second interface for data transmission via the SINEC L1 bus,

you need the

SINEC L1 submodule (from Version 6ES5 928-3UB12).

The CPU 928B is delivered without an interface submodule. You can operate

the CPU 928B without an integral interface submodule. The opening to

accept a submodule in the front plate is closed by a cover. Only remove the

cover to fit an interface submodule.

A description of interface submodules can be found in Section 5.11, and the

order numbers in the ordering information.

A detailed description of the second interface can be found in the CPU 928B

Communication Manual.

There is an interrupt line in the PLC for each CPU. It can be used when the

reaction to an event must occur with higher priority than the reaction to other

events.

To process an interrupt, cyclic program processing is interrupted and the

program stored in OB 2 (OB for interrupt processing) is inserted.

(Refer to the CPU 928B Programming Guide for further details.)

This interrupt-driven program processing is only possible using an

interrupt-capable digital input module or a suitable operating CP/IP module.

No jumper setting on the CPU 928B is required. Please note, however, that

the usable interrupt line on the backplane bus depends on the CPU slot and

must be set accordingly on the I/O module (see Section 4.1).

Second Interface

SI2

Process Interrupt

Processing

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5.4.2 Installation and Startup

Note

All jumpers on the CPU 928B are required by the manufacturer for quality

testing. You must not change the jumper settings.

!Caution

Switch off the power supply before removing or inserting the module. The

basic board and expansion board of the CPU 928B are one unit and must not

be separated.

Proceed as follows to insert the CPU in the central controller:

Step Action

1Release the upper locking bar of the central controller and ensure

that the locking pin for the module is correctly positioned with the

slot-head horizontal.

2Select the correct slot (based on the labelling of the locking bar).

Insert the CPUs in the S5-135U/155U from slot 11.

3Push the module evenly into the guide rail until the lever over the

locking pin is horizontal.

4Press the locking pin inwards on the bottom of the module and

rotate it 90o clockwise.

5Secure the upper locking bar.

Jumper Settings

Removing and

Inserting the

Module

Insertion

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Proceed as follows to remove the CPU:

Step Action

1Release the upper locking bar of the central controller.

2Release the locking pin of the module.

3Press the release lever downwards and pull the module forwards

and out of the central controller.

Note

Only operate the CPU 928B with the submodule receptacle closed. You

close it either by fitting an interface submodule or with the cover supplied.

Removal

CPUs, Memor

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The controls and indicators are arranged on the front plate of the CPU

module:

SIEMENS

Receptaclefor

User Memory Submodule

Mode Switch

LED (green)

LED (red)

Momentary-Contact Mode Switch

Fault Indicator LEDs (red)

PG Interface, 15-Pin

Interface SI 1

Release Lever

Locking Pin

Interface Fault Indicator LEDs (red)

Interface 1

Interface 2

RUN

STOP

RUN

STOP

RÜCKSETZEN

RESET

URLÖSCHEN

OVERALL RESET

SI1

SI2

QVZ

ADF

ZYK

BASP

Order Number and Version

Receptacle for Interface Submodule

Interface SI 2

SI2

SI1

6ES5928-3UB12

CPU 928B

Figure 5-6 Front Plate of the CPU 928B

Controls and

Indicators

CPUs, Memor

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The mode switch has two settings:

In the RUN setting, the CPU 928B processes the user program when the

green RUN LED is lit.

The CPU 928B goes to the stop state when you switch from RUN to STOP.

The red STOP LED then lights up.

You can initiate the Overall Reset, Reset and Restart functions with the

momentary-contact mode switch:

Momentary-contact switch down

With an overall reset, all RAM areas are erased and initialized (both on the

CPU and on a RAM submodule).

Momentary-contact switch up

During a reset, all flags, timers, counters and the process image will be

erased. OB 20 will be invoked. Processing of the user program will start from

the beginning again.

Momentary-contact switch at midpoint

With a restart, processing of the user program will continue from the point of

interruption. The statuses of flags, timers, counters and the process image are

retained during stoppage of the CPU.

Mode Switch

RUN

STOP

Momentary-

Contact Mode

Switch

OVERALL RESET

RESET

Restart

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RUN

LED STOP

LED Status

on off The CPU is in the RUN state.

off on The CPU is in the STOP state. After a stop

request by switch or PG function, the STOP LED

is continuously lit because the transition to the

STOP state was requested by the user or, in

multiprocessor operation, by another CPU, and

was not caused by the CPU itself.

off off The CPU is in the INITIAL START or program

check state.

off slow

flashing The CPU is in the STOP state. The CPU has

caused a transition to the STOP state (possibly

also for the other CPUs). If you set the mode

switch to STOP, the flashing LED becomes

continuously lit.

off rapid

flashing The CPU is in the STOP state. An overall reset

has been requested. This request can be initiated

by the CPU itself or by operator action.

QVZ LED

on During direct access or process image update, a module

addressed by the program no longer acknowledges although

either it has acknowledged in single-processor operation

upon reset of the CPU 928B in the area of the process

image (IB 0 to 127, QB 0 to 127) and has been entered as

present in the “9th track” (see Programming Guide,

CPU 928B),

it h b t d i DB 1 ( dd li t) i

or it has been entered in DB 1 (address list) in

multiprocessor or single-processor operation and has been

recognized as present during the reset.

Possible causes

Module failure.

Module was pulled out during operation, in the

STOP state or in the Off state without a subsequent reset.

Status Indicators

LEDs for Fault

Indication and

Signaling

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ADF LED

on The user program has referenced an I/O address in the

process image under which no module is inserted.

ZYK LED

on The maximum cycle monitoring time has been exceeded.

BASP LED

on Command output is inhibited and the digital outputs will be

directly switched to the safe state.

A detailed description of interrupt and error handling can be found in the

CPU 928B Programming Guide.

LED SI1 LED SI2 Cause

on on No communication possible at both interfaces.

Internal error.

on off SI1:

No communication possible. Internal error.

SI2:

If used, interface is initialized and ready.

off on SI1:

Interface is initialized and ready.

SI2:

No communication possible.

Wrong interface submodule inserted or wrong

parameters for interface or internal error.

off off First interface and, if used, second interface are

initialized and ready.

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The modules must be inserted at the correct slots in the central controller.

The backup battery must be fitted and in order for the CPU to start.

Step Action Result

1Set the mode switch to STOP.

2Switch the system voltage on. The following LEDs must light

up on the CPU:

– Red STOP LED (flashing

rapidly)

– Red BASP2) LED

3Hold the MC1) switch in the

OVERALL RESET setting

and simultaneously set the

mode switch from STOP to

RUN.

The red STOP LED is now

permanently lit.

1) MC: Momentary-contact

2) BASP: Command output inhibit

Step Action Result

1Set the mode switch to STOP.

2Hold the MC switch in the

RESET setting and

simultaneously set the mode

switch from STOP to RUN.

– Red STOP LED goes off

– Green RUN LED lights up

– Red BASP LED goes off

The CPU is now in the RUN state

but still has no user program.

You can also carry out a manual restart of the CPU 928B with the mode

switch. The CPU 928B Programming Guide will indicate when a manual

restart is permissible.

Step Action Result

3Set the mode switch from

STOP to RUN. – Red STOP LED goes off

– Green RUN LED lights up

– Red BASP LED goes off

For maintenance purposes or in the event of a fault, this startup without user

program in single-processor operation can serve to establish whether the CPU

is operating without errors.

Startup

Overall Reset

Reset

Restart

CPUs, Memor

Cards, Memor

Submodules, Interface Submodules

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