Спецификация протокола Profibus
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PROFIBUS-Specification-Normative-Parts-9:1997
Copyright by PNO 1997 - all rights reserved
Table 1: Values of the PhL Variables
Name Value
Interface mode - FULL_DUPLEX
- HALF_DUPLEX
Loop-back mode
- DISABLED
- in MDS at DTE-DCE interface
- in MAU near line connection
Preamble extension - 0 to 7 (preamble extension sequences)
Post-transmission gap extension - 0 to 7 (gap extension sequences)
Maximum inter-channel signal skew - 0 to 7 (gap extension sequences)
Transmitter output channel N
(1
≤
N
≤
8)
- ENABLED
- DISABLED
Receiver input channel N
(1
≤
N
≤
8)
- ENABLED
- DISABLED
Preferred receive channel - NONE
- 1 to 8
Ph-SETVALUE confirm
(status)
- The parameter status gives the status of the Ph-SETVALUE request primitive:
Success or Failure. The FMA1/2 converts these values into M_status_values
"OK" and "NO" for the FMA1/2_SET_VALUE.confirm primitive to the FMA1/2-User.
Get Value PhL
The service Get Value PhL is optional.
The FMA1/2 passes a Ph-GETVALUE request primitive to the PhL to read a specified
variable. The PhL transfers the value of the variable in a Ph-GETVALUE confirm
primitive to the FMA1/2.
Parameters of the Primitives
Ph_GETVALUE.request
(parameter name)
- The parameter, parameter name, specifies the variable.
Ph_GETVALUE.confirm
(current value)
- The parameter, current value, contains the current value that has been
requested by the last Ph-GETVALUE request primitive. The values of table 1
shall apply for the variables. In case of a failure, the value "Failure" is
given to all variables. FMA1/2 converts this value into M-status-value "NO"
for the FMA1/2_Read_Value.confirm primitive to the FMA1/2-User.
Page 912
PROFIBUS-Specification-Normative-Parts-9:1997
Copyright by PNO 1997 - all rights reserved
10.3.3.3 Event PhL
The service Event PhL is optional.
The PhL uses this service to notify the FMA1/2 that variables have been changed
their value.
Parameters of the Primitives
Ph-EVENT indication
(parameter name)
- The parameter, parameter name, specifies which variable has changed its value
without a request of the FMA1/2 (cf IEC 1158-2, clause 6):
Table 2: Values of the EVENT parameter (parameter name), (cf Table 37 of Part 3)
Parameter name and value
DTE fault
DCE fault
10.4 Coding of the FDL and PhL Variables
The range of values of the FDL and PhL variables are defined in the subclauses
11.2.3.2 and 11.3.3.2 of this part. In addition, a bit coding is given according
to the stipulations of the data type in FMA7 (cf subclause 4.8 of Part 7). While
using IEC 1158-2 the FDL range of values given in Part 7, subclause 4.5.3 shall
be adhered to.
10.4.1 Coding of the FDL-Variables
Baud_rate:
(10) - 31.25 Kbaud
11.4.2 Coding of the Variables
Interface_mode:
(0) - FULL_DUPLEX
(1) - HALF_DUPLEX
Loop_back_mode:
(0) - DISABLED
(1) - in_MDS_at_DTE_DCE_interface
(2) - in_MAU_near_line_connection
Preamble_extension:
(0) to (7) - 0 to 7 octet preamble extension
Page 913
PROFIBUS-Specification-Normative-Parts-9:1997
Copyright by PNO 1997 - all rights reserved
Post_transmission_gap_extension:
(0) to (7) - 0 to 7 bit times
Maximum_inter_channel_signal_skew:
(0) to (7) - 0 to 7 bit times
Transmitter_output_channel:
LSB
MSB
Channel 1
b1
Channel 3
b3
Channel 2
b2
Channel 5
b5
Channel 4
b4
Channel 7
b7
Channel 6
b6
Channel 8
b8
Notation herein for every channel:
(0) - ENABLED
(1) - DISABLED
Figure 15: Encoding of the Transmitter_output_channel
eceiver_input_channel:
LSB
MSB
Channel 1
b1
Channel 3
b3
Channel 2
b2
Channel 5
b5
Channel 4
b4
Channel 7
b7
Channel 6
b6
Channel 8
b8
Notation herein for every Channel:
(0) - ENABLED
(1) - DISABLED
Figure 16: Encoding of the Receiver_input_channel
Preferred_receive_channel:
(0) - NONE
(1) - (8) - Channel 1 - Channel 8
Page 914
PROFIBUS-Specification-Normative-Parts-9:1997
Copyright by PNO 1997 - all rights reserved
10.4.3 List of Object Attributes
In addition to part 7, subclause 4.8, the object attributes defined in table 3
shall be used.
Table 3: Object Attributes
Attribute Data type
Interface_mode
Loop_back_mode
Preamble_extension
Post_transmission_gap_extension
Maximum_inter_channel_signal_skew
Transmitter_output_channel
Receiver_input_channel
Preferred_receive_channel
Unsigned8
Unsigned8
Unsigned8
Unsigned8
Unsigned8
Unsigned8
Unsigned8
Unsigned8
Page 915
PROFIBUS-Specification-Normative-Parts-9:1997
Copyright by PNO 1997 - all rights reserved
Appendix A (informative)
Examples of Realizations
A.1 Repeater
The repeater structures described in Part 2, subclause 2-A.1, shall apply
furthermore. Instead of the RS-485/TTL receiver and transmitter circuits (Figs.
2-A.1 and 2-A.2 in Part 2), circuits with the technical features (transmitter
level and timing, receiver circuit specification) of IEC 1158-2 are planned.
Regarding the self-controlled repeater, the directional control should be
executed on the one hand at the beginning of the preamble, on the other hand at
the end of the end-delimiter or the post-transmission gap.
For a linear bus or tree topology four repeaters may be used at most. It has to
be considered thereby that at most 127 stations may be operated with that kind
of structure.
A.2 Structures of PROFIBUS Controllers
The structures of PROFIBUS Controllers are designed as described in PROFIBUS
Specification "Controllers", with consideration of IEC 1158-2, for connecting a
field automation unit (control station, central processing station) or a field
device to the transmission medium.
However, it shall be considered that a transceiver and a USRT (Universal
Synchronous Receiver/Transmitter) are used according to the technical
specifications of IEC 1158-2 instead of a RS-485 transceiver and UART.
A.3 System with several Bus Lines to one Control Station
As described in clause 2-A.3 of Part 2, several bus lines may be used at one
control station when applying IEC 1158-2. One USRT device instead of one UART
device is needed per bus line (Fig. 2-A.5 of Part 2).
A.4 Redundant Control Station
The structure of a redundant control station as described in clause 2-A.4 of
Part 2 is possible.
A.5 Bus Analysis / Diagnostic Unit (Bus Monitor)
The use of this specification makes possible a bus analysis / diagnostic unit as
described in clause 2-A.5 of Part 2.
A.6 Intrinsically safe Fieldbus with Power Supply
The intrinsically safe circuits require a limitation of the electrical power,
which in turn limits the number of stations.
E.g. for explosive group IIC according to EN 50020, it is assumed that 10
stations may be connected with 10 mA supply current each at I
K
≤
110 mA and
U
0
≤
14 V.
Page 916
PROFIBUS-Specification-Normative-Parts-9:1997
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A.7 Message Rate, System Reaction Time and Token Rotation Time
As described in clause 2-A.6 of Part 2, the message rate R
SYS
corresponds to the
possible number of message cycles per second in the system (cf subclause 4.2.3,
equation (23) of Part 4). The maximum system reaction time (also called station
or bus access time) for the cyclic send/request (polling) from one master
station to n slave stations (master slave system) is computed from the message
cycle time and the number of slave stations (cf subclause 4.2.3, equation (24),
of Part 4).
The times T are converted into t (seconds) for the following example
calculations:
Let t
SDR
=0.5 ms, t
ID
=1 ms and DATA_UNIT = 2, 10 and 50 octets with 30 slave
stations.
The request frame is in each case without DATA_UNIT (cf subclause 9.6.1, Fig.
8.1, of this part) while the response frame has a variable DATA_UNIT
(cf subclause 9.6.3, Fig. 10.2, of this part). Each frame is equipped according
to the specifications of IEC 1158-2 with a preamble and a Start Delimiter (1
octet each) and an End Delimiter (1 octet). Furthermore, message repetitions and
the times T
TD
are not considered. Token transfer times are irrelevant, because
there is only one master station in the system. The values are rounded.
Table A.1.1: Message Cycle Time
DATA_UNIT t
MAC
Time for One Message Cycle [ms]
Data Signaling Rate: 31.25 kbit/s
2 Byte 7
10 Byte 9
50 Byte 20
Table A.1.2: Message Rate
DATA_UNIT R
SYS
Number of Message Cycles / second [N/s]
Data Signaling Rate: 31.25 kbit/s
2 Byte 135
10 Byte 106
50 Byte 51
Page 917
PROFIBUS-Specification-Normative-Parts-9:1997
Copyright by PNO 1997 - all rights reserved
Table A.1.3: System Reaction Time
DATA_UNIT t
SR
System Reaction (Latency) Time
with 30 Slave Stations [ms]
Data Signaling Rate: 31.25 kbit/s
2 Byte 222
10 Byte 283
50 Byte 590
The same computational basis for the system reaction time is valid for a system
with several master stations as described in Part 2, Annex 2-A (equations 2-A.1
and 2-A.2). Figure A.1 shows the bounds of t
RR
versus the number of master
stations and high priority messages at 31.25 kbit/s. As in Part 2, Annex 2-A,
message repetitions and the time T
TD
are not considered. The computations are
based upon the token cycle time T
TC
and the combined token and message cycle
time T
TC
shown in Figs. 2-A.9 and 2-A.10 in Annex 2-A of Part 2.
The following values are assumed for the message cycle:
Send/Request Data with Reply: T
S/R
= 72 bit (1 octet preamble)
Response with 10 octets DATA_UNIT: T
A/R
= 176 bit (1 octet preamble)
The following implementation dependent times were chosen:
Token Cycle: at 31.25 kbit/s t
ID
= 0,5 ms
Token + Message Cycle:
at 31.25 kbit/s t
ID
= 0,5 ms ; t
ID´
= 1 ms;
t
SDR
= 0,5 ms
Page 918
PROFIBUS-Specification-Normative-Parts-9:1997
Copyright by PNO 1997 - all rights reserved
1-Message Cycle
per Token Rotation
na-Message Cycles
per Token Rotation
t
RR
[ms]
na
Number of
Master Stations
1
10
100
1000
2 5 10 15 20 25 30 32
Figure A.1: Real Token Rotation Time t
RR
(cf Fig. 2-A.13 in Part 2)
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Orchid Technologies
P & L Automatik
Parijat Controlware
Parker Hannifin
PEP Modular Computers
Pepperl + Fuchs Inc.
Philip Morris USA
Power Measurement
Professional Control
ProSoft Technology
RDE Connectors & Cables
Rexroth Indramat
RTC Group
Samson Controls
SHIP STAR Associates
Siemens E & A
SISCO Inc.
Smar Research Corp.
Softing GmbH
SoftPLC Corp.
Spectrum Controls
SST, Inc.
Steeplechase Software
Synergetic MicroSystems
Sytek
Taylor Industrial Software
Think & Do Software
Total Control Products
TR Encoder Solutions
TRS Fieldbus Systems
Viking Electric
VITA
WAGO Corporation
Weidmuller Inc.
Wieland Electric
Wonderware Corp.
Daniel Woodhead
Yaskawa Electric America