Siemens Simatic S7-300 User manual

A5E00213444-02

Product Information on the Manual

Edition 04.2003

S7-300 Module Specifications, Edition 11/2002, (A5E00105505-02)

Introduction

The S7-300 product family has been enhanced and improved. This document

contains details of the features and technical specifications of the modules.

Contents

Section Contents Page

1SM 321 digital input module; DI 16 DC 24 V;

with hardware interrupt and diagnostic interrupt, clocked;

(6ES7 321-7BH01-0AB0)

2SM 331 analog input module; AI 8 14 Bit High Speed,

clocked; (6ES7 331-7HF00-0AB0) 14

3Analog Output Module SM 332; AO 4 16 Bit, clocked; (6ES7

332-7ND01–0AB0) 25

2ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002

A5E00213444-02

1 SM 321 digital input module; DI 16 DC 24 V;

with hardware interrupt and diagnostic interrupt,

clocked; (6ES7 321-7BH01-0AB0)

Order number

6ES7 321-7BH01-0AB0

Characteristics

The SM 321; DI 16 DC 24 V; with hardware and diagnostic interrupts has the

following features:

S16 inputs, isolated in groups of 16

S24 VDC rated input voltage

SInput characteristic curve according to IEC 61131, Type 2

SSuitable for switches and two / three / four-wire BEROs (proximity switches)

S2 short-circuit-proof sensor supplies for 8 channels each

SExternal redundant power supply possible to supply sensors

S“Sensor supply (Vs)”status display

SGroup error display

SSupports clocked operation

SSupports the function “Reparameterization in RUN mode”

SProgrammable diagnostics

SProgrammable diagnostic interrupt

SProgrammable hardware interrupt

SProgrammable input delays

ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002

A5E00213444-02

Terminal connection diagram and block diagram of the

SM 321; DI 16 DC 24 V

Status display –green

Channel number

Backplanebus

interface

L+

M24 V

Sensor supplies Vs - green

L+

L +

Fault indicator –red

Wire break

detection

Wire break

detection

Figure 1 Module view and block diagram of the SM 321; DI 16 DC 24 V

4Product Information on the Manual S7-300 Module Specifications, Edition 11/2002

A5E00213444-02

Terminal assignment diagram for the redundant supply of sensors

The figure below shows how sensors can additionally be supplied by means of Vs

with a redundant voltage source –for example, via another module.

L+ 1 L+

2 L+

to the sensors

Digital input

module

Short-circuit-

proof driver

Figure 2 Terminal assignment diagram for the redundant supply of sensors of the SM

321; DI 16 DC 24 V

Terminal assignment diagram of the resistor wiring of the sensors

To detect a wire break, it is necessary to wire sensor contacts with a resistor.

L +/ Vs E x.x

15 kW... 18 kW

Figure 3 Terminal assignment diagram of the resistor wiring of the sensors of the SM

321; DI 16 DC 24 V

ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002

A5E00213444-02

Technical specifications of the SM 321; DI 16 DC 24 V

Dimensionsand Weight

Dimensions W H D

(in millimeters) 40 125 117

Weight Approx. 200 g

Data for Specific Module

Supports clocked

operation Yes

Reparameterization in RUN

mode possible Yes

SBehavior of non paramete-

rized inputs Supply the las valid

process value before

parameterization

Number of inputs 16

Length of cable

SUnshielded

SShielded max. 600 m

max. 1000 m

Voltages, Currents, Potentials

Power rated voltage of the

electronics and sensor L+ 24 VDC

SReverse polarity protection Yes

Number of inputs that can be triggered simultaneously

SHorizontal configuration

Up to 60 _C 16

SVertical configuration

Up to 40 _C 16

Isolation

SBetween channels and

backplane bus Yes

Permitted potential difference

SBetween the different

circuits 75 VDC / 60 VAC

Insulation tested with 500 VDC

Current consumption

SFrom the backplane bus max. 130 mA

SFrom load voltage L +

(without sensor supply VS)max. 90 mA

Power dissipation of the module typ. 4 W

Status, interrupts, diagnostics

Status display

SInputs Green LED per channel

SSensor power supplies (Vs) Green LED per output

Interrupts

SHardware interrupt

SDiagnostic interrupt Parameters can be

assigned

Parameters can be

assigned

Diagnostic functions Parameters can be

assigned

SGroup error display Red LED (SF)

SDiagnostics information

read-out Possible

Monitoring for

SWire break Yes, for I < 1 mA

Sensor Power Supply Outputs

Number of outputs 2

Output voltage

SWith load min. L+ (–2.5 V)

Output current

SRated value

SPermitted range 120 mA

0 to 150 mA

Additional (redundant) supply Permitted

Short-circuit protection Yes, electronic

Data for Selecting a Sensor

Input voltage

SRated value

SFor signal “1”

SFor signal “0”

24 VDC

13 to 30 V

From *30 to + 5 V

Input current

SAt signal “1”typ. 7 mA

Input characteristic curve According to IEC

61131, type 2

Connection of Two-Wire

BEROs

SPermitted bias current Possible

max. 2 mA

Resistor wiring of the sensor for

wire break monitoring 10 to 18 kOhm

Time/Frequency

Internal preparation time for

status processing (in

non-clocked operation)

SEnabling of hardware and

diagnostic interrupt max. 40 ms

Input delay

SParameters can be

assigned

SRated value

Yes

typ.

0.1/0.5/3/15/20 ms

6Product Information on the Manual S7-300 Module Specifications, Edition 11/2002

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1.1 Clock synchronization

Characteristics

Reproducible response times (i.e. times of the same length) are achieved in

SIMATIC by means of an equidistant DP bus cycle and the synchronization of the

following free-running individual cycles:

SFree-running cycle of the user program. On account of cyclic program branches

the length of the cycle time may vary.

SFree-running, variable DP cycle on the PROFIBUS subnet.

SFree-running cycle on the DP slave backplane bus.

SFree-running cycle at signal conditioning and conversion in the electronic

modules of the DP slaves.

With equidistance the DP cycle runs with the same clock pulse and for the same

length. The priority classes of a CPU (OB 61 to OB 64) and the clocked I/Os are

synchronized with this clock pulse. The I/O data are thus transferred at defined,

fixed intervals (clock synchronization).

Prerequisites

SThe DP master and DP slave must support clock synchronization. STEP 7 as of

Version 5.2 is required.

Mode: clock synchronization

The following conditions apply to clocked mode:

Filter and processing time TWE between the actual values being read in

and made available in the transfer buffer

(the specified value for TWE applies regardless of the activation of the

hardware interrupt or diagnosis)

255 to 345 ms

Includes an input delay of 100 ms

TDPmin 2.5 ms

Diagnostic interrupt max. 4 x TDP

Note

In clocked mode, the input delay of the inputs is always 100 ms, regardless of the

input delay parameterized in STEP7.

ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002

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Further information

You will find further information on clock synchronization in the online help system

of STEP 7, in the manual ET 200M Distributed I/O System and in the manual

Clock Synchronization.

1.2 Parameterizing the SM 321; DI 16 DC 24 V

Parameter assignment

Section 3.3 of the reference manual describes how digital modules are generally

parameterized.

Parameters of the SM 321; DI 16 DC 24 V

You will find an overview of the parameters that can be set for the SM 321;

DI 16 DC 24 V, together with the default settings, in the following table.

The default settings apply if you have not performed parameter assignment in

STEP 7.

Table 1 Parameters of the SM 321; DI 16 DC 24 V

Parameter Value Range Default

Settings Para-

meter

Type

Scope

Enable

SDiagnostic interrupt

SHardware interrupt Yes/no

Yes/no No

No Dynamic Module

Input delay/voltage type 0.1 ms (DC)

0.5 ms (DC)

3 ms (DC)

15 ms (DC)

20 ms (DC/AC)

(DC) Static Module

Diagnosis

SSensor supply missing

SWire break Yes/no

Yes/no No

No Static Channel

group

Trigger for hardware interrupt

SRising edge

SFalling edge Yes/no

Yes/no No

No Dynamic Channel

group

Assignment of the sensor supplies to channel groups

The module’s two sensor supplies supply two channel groups: inputs 0 to 7 and

inputs 8 to 15. In these channel groups you also parameterize the diagnosis for the

sensor supply.

8ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002

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Assigning interrupt parameters to channel groups

The table below shows the channels that can be combined to form a channel

group if you would like to parameterize interrupt processing.

You will need the channel group number to set the parameters in the user program

with an SFC.

Table 2 Assignment of the interrupt parameters to the inputs of the SM 321;

DI 16 DC 24 V

Parameter... Can Be Set in Following

Channel Groups Channel Group

Number

Hardware interrupt

(for falling, rising or both types of pulse

edges)

0 and 1

2 and 3

4 and 5

6 and 7

8 and 9

10 and 11

12 and 13

14 and 15

Diagnostic interrupt

(if there is no sensor supply) 0 to 7

8 to 15 -

Wire break 0 and 1

2 and 3 0

Tolerances of the programmable input delays

Table 3 Tolerances of the input delays of the SM 321; DI 16 DC 24 V

Programmed Input delay Tolerance

0.1 ms 60 to 140 ms

0.5 ms 400 to 900 ms

3 ms (preset) 2.6 to 3.3 ms

15 ms 12 to 15 ms

20 ms 17 to 23 ms

ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002

A5E00213444-02

1.3 Behavior and diagnostics of the SM 321; DI 16 DC 24 V

Effect of operating and mode supply voltage on the input values

The input values of the SM 321; DI 16 DC 24 depend on the operating mode of

the CPU and the supply voltage of the module.

Table 4 Dependencies of the input values of the operating mode of the CPU and the

supply voltage L+ of the SM 321; DI 16 DC 24 V

CPU Operating State Power Supply L+

to Digital Module Input Value of Digital

Module

POWER ON RUN L+ exists Process value

L+ missing 0 signal

STOP L+ exists Process value

L+ missing 0 signal

POWER OFF –L+ exists –

L+ missing –

Diagnostic messages of the SM 321; DI 16 DC 24 V

The table below provides an overview of the diagnostic messages of the SM 321;

DI 16 DC 24 V.

Table 5 Diagnostic messages of the SM 321; DI 16 DC 24 V

Diagnostics Message LED Scope of the

Diagnostics Parameters

can be

assigned

Sensor supply missing SF Channel group

Wire-break SF Channel group Yes

Module not parameterized SF Channel group

External auxiliary supply missing SF Module

Internal auxiliary power missing SF Module

Fuse blown SF Module

Incorrect parameter on module SF Module

Watchdog timeout SF Module No

EPROM error SF Module

RAM error SF Module

Hardware interrupt lost SF Module

10 ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002

A5E00213444-02

Note

A prerequisite for detecting the errors indicated by programmable diagnostic

messages is that you have assigned parameters to the digital module accordingly

in STEP 7.

Behavior upon failure of the supply voltage

The failure of the supply voltage of the SM 321; DI 16 DC 24 is always indicated

by the SF LED on the module. Furthermore, this information is made available on

the module.

The input value is initially held for 20 to 40 ms before the 0 signal is transferred to

the CPU. Supply voltage dips < 20 ms do not change the process value (see Table

4).

Triggering of the diagnostic interrupt depends on the parameter assignment (see

Section 1.4).

Failure of the supply voltage with redundant incoming supply for the sensor

supply

Note

If an external redundant source is applied simultaneously to the sensor supply

(Vs), a failure in the internal sensor supply causes a failure of the internal and/or

external sensor supply and/or a blown fuse to be indicated instead of a regular

sensor supply failure.

Short-circuit of sensor supply Vs

Irrespective of the parameter assignment, the corresponding Vs LED goes out if a

short-circuit of the sensor supply Vs occurs.

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