81-3124-ABS-IBS-2MBPS-RS422 1 04 SCM-1200-143
Fieldbus Appendix
Anybus-S Interbus 2Mbit/s RS422
SCM-1200-143
Rev. 1.04
Connecting DevicesTM
+$/067$'‡&+,&$*2‡.$5/658+(‡72.<2‡%(,-,1*‡0,/$12‡08/+286(‡&29(175<‡381(‡&23(1+$*(1
HMS Industrial Networks
Mailing address: Box 4126, 300 04 Halmstad, Sweden
Visiting address: Stationsgatan 37, Halmstad, Sweden
E-mail: [email protected]
Web: www.anybus.com
Table of Contents
Table of Contents
Preface
About This Manual
How To Use This Manual .................................................................................................................. P-1
Important user information................................................................................................................ P-1
Related Documentation ...................................................................................................................... P-1
Revision list ........................................................................................................................................... P-1
Conventions & Terminology.............................................................................................................. P-2
Sales and Support ................................................................................................................................. P-3
Chapter 1
About the Anybus-S Interbus 2Mbit/s RS422
Features...................................................................................................................................................1-1
Overview ................................................................................................................................................1-1
Status Indicators ...........................................................................................................................1-2
Application Connector...................................................................................................................1-2
Fieldbus Connectors ......................................................................................................................1-2
Baud Rate Switch .........................................................................................................................1-2
Compatible Products ............................................................................................................................1-2
Chapter 2
Data Exchange
Chapter 3
Fieldbus Specific Mailbox Commands
Alter amounts of PCP words (SET_PCP_WORDS).................................................................3-1
Set the Virtual Field Device Object (SET_VFD_OBJECT).....................................................3-2
Set Start Index (SET_START_INDEX) ................................................................................3-3
Set PCP Object (SET_PCP_OBJECT).....................................................................................3-4
Set the PDU sizes (SET_PDU_SIZES) ...................................................................................3-7
Set Module Function (SET_MOD_FUNC) ..............................................................................3-8
Chapter 4
Fieldbus Specific Area
Control area............................................................................................................................................4-1
Appendix A Mechanical Specification
Appendix B Connector Pinouts
Fieldbus Connector - Bus IN ............................................................................................................. B-1
Fieldbus Connector - Bus OUT ........................................................................................................ B-2
Appendix C Environmental Specification
Temperature.......................................................................................................................................... C-1
Relative Humidity................................................................................................................................. C-1
EMC compliance.................................................................................................................................. C-1
Table of Contents II
Appendix D Electrical Characteristics
Supply Voltage ......................................................................................................................................D-1
Power Consumption............................................................................................................................D-1
PE Grounding ......................................................................................................................................D-1
Appendix E Calculating the PCP Transmission Time
Preface
About This Manual
How To Use This Manual
This manual provides an overview of the Anybus-S Interbus 2Mbit/s slave module and is intended to
be used as a supplement to the Anybus-S Parallel Design Guide.
The reader of this document is expected to have basic knowledge in the Interbus fieldbus system, and
communication systems in general.
Important user information
The data and illustrations found in this document are not binding. We, HMS Industrial Networks AB,
reserve the right to modify our products in line with our policy of continuous product development. The
information in this document is subject to change without notice and should not be considered as a commitment by HMS Industrial Networks AB. HMS Industrial Networks AB assumes no responsibility for
any errors that may appear in this document.
There are many applications of this product. Those responsible for the use of this device must ensure
that all the necessary steps have been taken to verify that the application meets all performance and safety requirements including any applicable laws, regulations, codes, and standards.
Anybus® is a registered trademark of HMS Industrial Networks AB. All other trademarks are the property of their respective holders.
Related Documentation
Document name
Anybus-S Parallel Design Guide
Author
HMS Industrial Networks AB
Revision list
Revision
1.00
1.01
1.02
1.03
Date
2003-04-01
2003-11-10
2003-12-06
2005-11-04
Author
PeP
ToT
PeP
ToT
Chapter
All
Appendix D
Appendix D
Chapter 4
Appendix B
1.04
2012-05-18 KeL
Chapter 3
Titlepage, preface
Description
First release
Corrected PCP example data
Added power consumption
Added information about when the module itself
generates ‘StatErr’.
Removed RBST signal since it does not exist. Corrected signal names for screw terminal bus output
connector
Added mailbox SET_MOD_FUNC
Updated sales and support information
About This Manual P-2
Conventions & Terminology
The following conventions are used throughout this manual:
•
Numbered lists provide sequential steps
•
Bulleted lists provide information, not procedural steps
•
The term ‘module’ is used when referring to the Anybus module
•
The term ‘application’ is used when referring to the hardware that is connected to the Anybus
Application Connector
•
Hexadecimal values are written in the format NNNNh, where NNNN is the hexadecimal value.
About This Manual P-3
Sales and Support
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Chapter 1
About the Anybus-S Interbus 2Mbit/s RS422
The Anybus-S Interbus 2Mbit/s module is a slave node that can be read from/written to by an Interbus
master. Being a slave module, it cannot initiate communication to other nodes; it only responds to incoming requests.
Interbus has two ways of exchanging data; one through fast cyclical I/O data called ‘Process Data’, and
one through a somewhat slower protocol called PCP, which is mainly used for configuration purposes.
The module supports up to 10 words of data on the bus, out of which up to four words can be used for
PCP.
Features
•
Galvanically isolated bus electronics
•
500kbit/s and 2Mbit/s operation
•
Up to 10 words of data (Process Data + PCP)
•
PCP v2.0 (0, 1, 2 or 4 words)
Overview
7
1
6
4
2
#
1
2
3
4
5
6
7
5
3
Description
Application Connector
Bus IN interface
Bus OUT interface
Baud rate Switch
Status Indicators
UL / Bus voltage OK indication
Anybus-S Watchdog (See general Anybus-S Parallel Design Guide)
About the Anybus-S Interbus 2Mbit/s RS422 1-2
Status Indicators
These LEDs indicate run time status and errors to the user.
Led
1 - CC/RC
2 - BA
3 - RD
4 - TR
Colour
Green
Green
Yellow
Green
1
2
3
4
Description
Cable connection is good and the Interbus master is not in reset mode.
Bus active
Remote bus disabled
PCP-communication active. Hold time = 500ms
Application Connector
The application connector features a standard Anybus-S 2kbyte parallel interface. For further information, please consult the general Anybus-S Parallel Design Guide.
Fieldbus Connectors
The module features D-sub connectors as standard. However, other connectors are also available. See
Appendix B-1 “Connector Pinouts” for connector types and pinouts.
Bus IN
Bus OUT
Baud Rate Switch
The module supports 2Mbit/s and 500kbit/s operation. To select the
desired baud rate, just move the jumper cap to the corresponding location, see figure on the right.
Note: The baud rate must be selected before power on, i.e. it must not
be changed during normal operation.
2M
500k
Compatible Products
This product is a member of the Anybus concept of interchangeable fieldbus modules. This makes it
fully interchangeable with any Anybus-S supported fieldbus system with only little or no hardware and
software adjustments.
Chapter 2
Data Exchange
The module can use both fast I/O data and Parameter data. On the Interbus network, Fast I/O data is
represented as Process Data, while Parameter Data is represented as PCP data. On InterBus, there is an
equal amount of Input and Output Process Data. The amount of PCP data is equal to the total I/O
length minus the size of the Process Data, for both Input and Output data.
Note: Not all Interbus masters, (especially older ones) support PCP-data. In this case, initialise the module with Process Data only.
The I/O lengths must be defined before the module can be used on the network. This is accomplished
during initialization of the module. Consult the general Anybus-S Parallel Design Guide for more information.
The layout of the default PCP objects are arrays of 32 bytes (Unsigned 8), with no password or group
protection. Objects 0x6000 through 0x603F are linearly mapped to the Parameter Output Data area and
are both readable and writeable by the Interbus master. The objects 0x6040 to 0x607F are linearly
mapped to the Parameter Output Data area and are read only by the Interbus master.
The objects are created to match the amount of Parameter Data indicated in the Anybus Init command.
Example:
If 48 bytes are desired as Output Parameter Data and 15 bytes are desired as input parameter
data, this will result in the following objects:
0x6000 - Array with a length of 32 bytes.
0x6001 - Array with a length of 16 bytes.
0x6040 - Array with a length of 15 bytes.
Chapter 3
Fieldbus Specific Mailbox Commands
Alter amounts of PCP words (SET_PCP_WORDS)
The amount of PCP words can be set to 0, 1, 2 or 4 words. If parameter data has been selected by the
Anybus_INIT command, one PCP word is used by default. If no parameter data has been selected, the
default number of PCP words is 0.
Parameter
Command initiator
Command Name
Message type
Command number
Fragmented
Extended Header data
Command data
Response data
Description
Application
SET_PCP_WORDS
02h
0001h
No
Number of PCP words
The message data contains the requested PCP length. If the SET_PCP_WORDS mailbox
message is wrong, see error code. If error code Fh is displayed, see Extended word 8 for
details:
0001h - Non valid value (0, 1, 2, 4).
0002h - Does not fit with the current process data length.
0003h - Can not disable PCP data since parameter data exists.
Command and response layout:
Message ID
Message information
Command
Data size
Frame count
Frame number
Offset high
Offset low
Extended word 1
Extended word 2
Extended word 3
Extended word 4
Extended word 5
Extended word 6
Extended word 7
Extended word 8
Message data byte 1
Command
(ID)
4002h
0001h
0001h
0001h
0001h
0000h
0000h
Number of PCP words
Expected response
(ID)
0002h
0001h
0001h
0001h
0001h
0000h
0000h
Fault information
Number of PCP words
Fieldbus Specific Mailbox Commands 3-2
Set the Virtual Field Device Object (SET_VFD_OBJECT)
The Virtual Field Device Object can be altered to show other manufacturer, device name and revision
strings than the ones that are shown by default. The strings should be entered in Pascal notation, i.e. the
length of the string (no. of characters) should be placed first in the string. Each of the strings has a length
of 16 characters (out of which one determines the length of the string).
Parameter
Command initiator
Command Name
Message type
Command number
Fragmented
Extended Header data
Command data
Response data
Description
Application
SET_VFD_OBJECT
02h
0002h
No
Length and characters of the strings (Length byte itself not included in the size.)
The message data contains the requested length and values of the strings. If the
SET_VFD_OBJECT mailbox message is wrong, see error code. If error code Fh is displayed, see Extended word 8 for details:
0001h - No PCP words.
0002h - String set to be longer than 15 bytes.
Command and response layout:
Message ID
Message information
Command
Data size
Frame count
Frame number
Offset high
Offset low
Extended word 1
Extended word 2
Extended word 3
Extended word 4
Extended word 5
Extended word 6
Extended word 7
Extended word 8
Message data byte 1
Message data byte 2
Message data byte 3
Message data byte 17
Message data byte 18
Message data byte 19
Message data byte 33
Message data byte 34
Message data byte 35
Command
(ID)
4002h
0002h
0030h
0001h
0001h
0000h
0000h
Manufacturer name length
First character
Second character
..
Device name length
First character
Second character
..
Revision name length
First character
Second character
Expected response
(ID)
0002h
0002h
0030h
0001h
0001h
0000h
0000h
Fault information
Manufacturer name length
First character
Second character
..
Device name length
First character
Second character
..
Revision name length
First character
Second character
Length in bytes
Length in bytes
Length in bytes
Fieldbus Specific Mailbox Commands 3-3
Set Start Index (SET_START_INDEX)
If the PCP objects are to be redefined, it is also possible to change the start index from which they originate. This mailbox has to be transmitted prior to sending down the mailbox command “Set PCP Object”. Please note that this mailbox command will completely erase the existing Object Dictionary so
that the new one can be created later with the above mentioned mailbox command. This mailbox command can only be used once. Also note that this mailbox command will generate an error if the PCP
word length is set to 0. Suggested start index is 0x6000. Maximum index of the objects to be downloaded
will be Start index + 0xFF.
Parameter
Command initiator
Command Name
Message type
Command number
Fragmented
Extended Header data
Command data
Response data
Description
Application
SET_START_INDEX
02h
0003h
No
Start index
The message data contains the requested start index. If the SET_START_INDEX mailbox
message is wrong, see error code. If error code Fh is displayed see Extended word 8 for
details:
0001h - No PCP words
0002h - Has already been defined
0003h - Value out of range (Valid range: 0100h - FF00h)
Command and response layout:
Message ID
Message information
Command
Data size
Frame count
Frame number
Offset high
Offset low
Extended word 1
Extended word 2
Extended word 3
Extended word 4
Extended word 5
Extended word 6
Extended word 7
Extended word 8
Message data byte 1
Message data byte 2
Command
(ID)
4002h
0003h
0002h
0001h
0001h
0000h
0000h
Start index
Start index
Expected response
(ID)
0002h
0003h
0002h
0001h
0001h
0000h
0000h
Fault information
Start index
Start index
High byte
Low byte
Fieldbus Specific Mailbox Commands 3-4
Set PCP Object (SET_PCP_OBJECT)
The object dictionary of the Anybus-S Interbus module can be changed to better suit the needs of a special implementation which uses the module. After setting a start index, new objects can be downloaded
to the module. This mailbox can only be sent after the SET_START_INDEX mailbox has been sent.
Note: It is not recommended to download a new object dictionary without knowledge of the PCP-protocol.
Parameter
Command initiator
Command Name
Message type
Command number
Fragmented
Extended Header data
Command data
Response data
Description
Application
SET_PCP_OBJECT
02h
0004h
No
Contains information about the PCP object.
The message data contains the requested PCP-object.
If error code Fh is returned please see the Extended word 8 for further information.
0001h - No start index given.
0002h - Index out of bounds.
0003h - Not a supported index type.
0004h - Error with the selection of IN/OUT buffer and the access rights.
0005h - Object outside the specified memory area length.
0006h - Too many characters in object name.
0007h - PCP-object length + 6 is larger than the PDU size.
Fieldbus Specific Mailbox Commands 3-5
Command and response layout:
Message ID
Message information
Command
Data size
Frame count
Frame number
Offset high
Offset low
Extended word 1
Extended word 2
Extended word 3
Extended word 4
Extended word 5
Extended word 6
Extended word 7
Extended word 8
Message data byte 1
Message data byte 2
Message data byte 3
Message data byte 4
Message data byte 5
Message data byte 6
Message data byte 7
Message data byte 8
Message data byte 9
Message data byte 10
Message data byte 11
Message data byte 12-22
Message data byte 23
Command
(ID)
4002h
0004h
0017h
0001h
0001h
0000h
0000h
Start index
Start index
Index type
Password
Access groups
Buffer type
Access rights
Access rights
Offset
Offset
Object name length
Object name string
Number of elements
Expected response
(ID)
0002h
0004h
0017h
0001h
0001h
0000h
0000h
Fault information
Start index
Start index
Index type
Password
Access groups
Buffer type
Access rights
Access rights
Offset
Offset
Object name length
Object name string
Number of elements
High byte
Low byte
High byte
Low byte
High byte
Low byte
Fieldbus Specific Mailbox Commands 3-6
•
Index
The desired index of the PCP-object
•
Index Type
Type of variable of the object
01h:
02h:
03h:
04h:
05h:
06h:
07h:
08h:
•
Boolean
Integer (8 bit)
Integer (16 bit)
Integer (32 bit)
Unsigned (8 bit)
Unsigned (16 bit)
Unsigned (32 bit)
Floating point (32 bit)
Password
The desired password for the object
•
Access Groups
The objects access groups
•
Buffer Type
Selection whether the In or Out area of the module shall be used
00h:
01h:
•
Use the output buffer
Use the input buffer
Access rights
The access rights for the object
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
-
-
-
-
-
-
AW
AR
-
-
GW
GR
-
-
PW
PR
PR
PW
GR
GW
AR
AW
-
Password read access
Password write access
Group read access
Group write access
All read access
All write access
Example
To allow all to read the parameter but only let the ones with the correct password write to it,
would give 0x0102 as access rights.
•
Offset
The offset within the parameter data area of the module to be used.
•
Object Name Length
Length of Object Name in bytes. Maximum value is 11.
•
Object Name String
Ascii string containing the Object Name. Maximum length is 11 bytes.
•
Number of Elements
The amount of elements within an array object. If set to 0, the object will be a simple variable
object instead.
Fieldbus Specific Mailbox Commands 3-7
Set the PDU sizes (SET_PDU_SIZES)
This mailbox sets the sizes of the input and output PDU (Protocol Data Unit), which sets up the transmit and receive buffers used for PCP communication. In case larger objects are to be downloaded by
the SET_PCP_OBJECT mailbox, it might be necessary to increase the PDU-sizes. The buffers should
be at least 6 bytes larger than the payload data of the objects.
Parameter
Command initiator
Command Name
Message type
Command number
Fragmented
Extended Header data
Command data
Response data
Description
Application
SET_PDU_SIZES
02h
0005h
No
PDU lengths (Receive and Transmit is related to the Anybus-S node)
PDU lengths. If error code Fh is returned please see the Extended word 8 for further information.
0001h - PDU length less than 51
0002h - PDU length larger than 246
Command and response layout:
Message ID
Message information
Command
Data size
Frame count
Frame number
Offset high
Offset low
Extended word 1
Extended word 2
Extended word 3
Extended word 4
Extended word 5
Extended word 6
Extended word 7
Extended word 8
Message data byte 1
Message data byte 2
Command
(ID)
4002h
0005h
0002h
0001h
0001h
0000h
0000h
Receive PDU length
Transmit PDU length
Expected response
(ID)
0002h
0005h
0002h
0001h
0001h
0000h
0000h
Fault information
Receive PDU length
Transmit PDU length
Fieldbus Specific Mailbox Commands 3-8
Set Module Function (SET_MOD_FUNC)
This mailbox is used to set the identity of the Interbus interface. It can only be sent during initialization.
Note: The mailbox does not check that the Module Function that is set, has any correspondence in reality.
Parameter
Command initiator
Command Name
Message type
Command number
Fragmented
Extended Header data
Message data
Response data
Description
Application
SET_MOD_FUNC
02h
0006h
No
Contains mirrored data
The response indicates if the command was accepted
Command and response layout:
Message ID
Message information
Command
Data size
Frame count
Frame number
Offset high
Offset low
Extended word 1
Extended word 2
Extended word 3
Extended word 4
Extended word 5
Extended word 6
Extended word 7
Extended word 8
Message data byte 1
•
Command
(ID)
4002h
0006h
0001h
0001h
0001h
0000h
0000h
Module Function
Expected response
(ID)
4002h
0006h
0001h
0001h
0001h
0000h
0000h
Fault Information
Module Function
Module Function
Types of module function codes that are recommended.
01h:
02h:
03h:
31h:
32h:
33h:
F0h:
F1h:
F3h:
Digital output module
Digital input module
Digital input and output modules
Analog output module
Analog input module
Analog input and output modules
Modules with parameter channel (2 PCP words)
Modules with parameter channel (4 PCP words)
Modules with parameter channel (1 PCP word)
Any function code, except 0, can be set, but the module codes specified above are recommended.
An incorrect value will be indicated with fault information “Invalid Other” (0001h).
Chapter 4
Fieldbus Specific Area
This area contains data that is used for fieldbus specific features.
Address (Hex)
640h
641h - 64Fh
650h
651h
652h
653h - 65Fh
Contents
StatErr Indication
(reserved)
Access
Read / Write
-
ModAck Counter
Physical Interface Type
Actual Baud rate
(reserved)
StatErr Indication (640h, R/W)
Read Only
Read Only
Read Only
-
b7
b6
b5
b4
b3
b2
b1
b0
-
-
-
-
-
-
-
STERR
The StatErr Indication bit is used when the application needs to indicate a serious fault to the master.
For the master to recognize a fault, the STERR bit must be set for at least 300ms. The master can acknowledge the fault by increasing the ModAck Counter register in the Fieldbus specific output area.
Note that the module itself can also use the StatErr Indication to tell the bus master that the application
has stopped operating though this will not be visible via the STERR bit in this register. This occurs if
the difference between the outbound and inbound watchdog counter registers in the DPRAM exceeds
the value specified in the Anybus_INIT mailbox message. Also note that a watchdog counter error is a
non recoverable error, the module must be reset in order to clear it.
ModAck Counter (650h, RO)
If a serious fault has been reported by the application via the StatErr Indication register in the Fieldbus
specific output area, the master can acknowledge the fault by increasing this register. If the reported error no longer exists, the StatErr signal should be removed.
Actual Baud Rate (652h, RO)
After initialisation, this register indicates what baud rate that is configured for the module. The module
is locked to this baud rate and can not be used with masters that uses other baud rates.
Values:
00h - 500kbit/s
01h - 2Mbit/s
Control area
For further information about the Control Area contents, please see the Anybus-S Design Guide.
Fieldbus Type
Values:
0011h - Interbus 2Mbit/s
Appendix A
Mechanical Specification
The circuit board is designed according to the Anybus-S specification. Consult the general Anybus-S
Parallel Design Guide for more information.
30.8
9.2
4.6
Ø 2.9
12.6
6.3
2.5
7.5
9.7
6,4-12,2mm
13.7
16
75.6
50
12.1
0
22
15.8
Appendix B
Connector Pinouts
Fieldbus Connector - Bus IN
Male 9-pin D-sub (Recommended)
Pin
Housing
1
2
3
4
5
6
7
8
9
Signal
PE
DO1
DI1
GND
NC
NC
/DO1
/DI1
NC
NC
Description
Protective Earth
Non inverted data output
Non inverted data input
Signal ground
Inverted data output
Inverted data input
-
15
Female
Male
69
51
96
Screw terminal / Pluggable Screw Terminal
Pin
1
2
3
4
5
6
Signal
/DO1
DO1
/DI1
DI1
GND
PE
Description
Inverted data output
Non inverted data output
Inverted data input
Non inverted data input
Signal ground
Protective Earth
1
6
1
6
2mm Board to Board connector
Pin
1
2
3
4
5
6
7
8
9
10
Signal
PE
DO1
DI1
/DO1
/DI1
GND
NC
NC
NC
NC
Description
Protective Earth
Non inverted data output
Non inverted data input
Inverted data output
Inverted data input
Signal ground
-
1
10
Connector Pinouts B-2
Fieldbus Connector - Bus OUT
Female 9-pin D-sub (Recommended)
Pin
Housing
1
2
3
4
5
6
7
8
9
Signal
PE
DO2
DI2
GND
NC
GND
/DO2
/DI2
NC
NC
Description
Protective Earth
Non inverted data output
Non inverted data input
Signal ground
Signal ground
Inverted data output
Inverted data input
-
5
Female
9
1
6
Screw terminal / Pluggable Screw Terminal
Pin
1
2
3
4
5
6
7
Signal
PE
/DO2
DO2
/DI2
DI2
GND
NC
Description
Protective Earth
Inverted data output
Non inverted data output
Inverted data input
Non inverted data input
Signal ground
-
1
7
1
7
2mm Board to Board connector
Pin
1
2
3
4
5
6
7
8
9
10
Signal
PE
GND
NC
NC
NC
GND
/DI2
/DO2
DI2
DO2
Description
Protective Earth
Signal ground
Signal ground
Inverted data input
Inverted data output
Non inverted data input
Inverted data output
1
10
Appendix B
Environmental Specification
Temperature
Operating
+0 to +70 degrees Celsius
Test performed according to IEC-68-2-1 and IEC 68-2-2.
Non Operating
-15 to +85 degrees Celsius
Test performed according to IEC-68-2-1 and IEC 68-2-2.
Relative Humidity
The product is designed for a relative humidity of 5 to 95% non condensing.
Test performed according to IEC 68-2-30.
EMC compliance
Emission
According to EN 50 081-2:1993
Tested per 55011:1990, class A, radiated
Immunity
According to EN 61000-6-2:1999
Tested per
EN 61000-4-2:1995
EN 61000-4-3:1996
EN 61000-4-4:1995
EN 61000-4-5:1995
EN 61000-4-6:1996
Appendix D
Electrical Characteristics
Supply Voltage
Both the module electronics and the fieldbus interface requires a regulated 5V DC power supply. For
more information regarding power requirements, consult the Anybus-S Parallel Design Guide.
Power Consumption
The maximum total power consumption for bus and electronics is 400mA.
PE Grounding
A PE-connection is included on one of the mounting holes according to the Anybus-S specification.
Appendix D
Calculating the PCP Transmission Time
The formula below can be used to calculate the transmission time for a PCP message.
Formula:
TD = TL + Gm( OD, N ) * Z + TL7
Gm = ( OD, N ) = (( N + OD - 1 ) / m ) + 1
TD
Transmission time of a PCP service in milliseconds
TL
Latency 2 * Z (milliseconds)
OD
Service dependent overhead
N
User data
Z
Interbus cycle time (milliseconds)
TL7
Layer 7 runtime typical 4.0 milliseconds
m
Width of parameter channel (in bytes) - 1 (control information)
Gm( OD, N )
Number of cycles that are required to transmit the overhead and user data
The division through m should be an integer division.
Example:
The following example uses the above formula to calculate the PCP transmission time for a Write
service.
Write Request:
Read Response:
OD = 7 bytes for one write request
OD = 4 bytes for a read response
N = 128 bytes (e.g. one parameter set)
N = 0 bytes (no user data)
Z = 1.5 milliseconds
Z = 1.5 milliseconds
Description
Write Request: Parameter channel with a width of 1 word
Write Request: Parameter channel with a width of 2 words
Write Request: Parameter channel with a width of 4 words
Read Response: Parameter channel with a width of 1 word
Read Response: Parameter channel with a width of 2 words
Read Response: Parameter channel with a width of 4 words
m
2-1
4-1
8-1
2-1
4-1
8-1
Gm
135
45
20
4
2
1
Td
209.5 ms
74.5 ms
37 ms
13ms
10 ms
8.5 ms
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