Siemens Simatic S7-300 User manual

Copyright 2003 by Siemens AG
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)
2
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

3
ProductInformation on the Manual S7-300 Module Specifications, Edition 11/2002
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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
SF
Vs
Vs
Sensor supplies Vs - green
M
M
L+
Vs
Vs
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
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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.
Vs
M
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

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

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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
0
1
2
3
4
5
6
7
Diagnostic interrupt
(if there is no sensor supply) 0 to 7 8 to 15 -
Wire break 0 and 1
2 and 3 0 1
:
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

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