SEW-Eurodrive Movitrac 31 Series User manual

0923 0580 / 0397
MOVITRAC®31..
Frequency Inverter
Manual
Communications Interfaces
and Parameter List
Edition 12/96
08/141/93

2 MOVITRAC
®
31.. Communications Interfaces and Parameter List
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PAGE
1 Introduction . . . .......................... 4
2 Communications Interfaces . . .................... 6
2.1 Mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.1 Communications protocol . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.2 Return codes (RC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.3 Application examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 The RS-232 interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.1 Connecting the MOVITRAC®31.. to a PC . . . . . . . . . . . . . . . . . . 14
2.2.2 Technical data of the RS-232 interface . . . . . . . . . . . . . . . . . . . 15
2.3 The RS-485 interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3.1 Networking the MOVITRAC®31.. . . . . . . . . . . . . . . . . . . . . . . 16
2.3.2 Master-slave operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3.3 Technical data of the RS-485 interface . . . . . . . . . . . . . . . . . . . 17
2.4 Communicating with a PLC . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.4.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.4.2 Initializing the PLC module CP523 in the user program . . . . . . . . . . 19
2.4.3 Example: Reading the parameter “Heat sink temperature” (P 001) . . . . 20
2.4.4 Example: Writing the parameter “T11 RAMP UP” (P 120) . . . . . . . . . 21
3 Data Formats . . . ..........................22
3.1 4-byte BCD format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2 4-byte binary format . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.3 8-byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4 Parameter List . . ..........................24
Display values P 000 - P 079 . . . . . . . . . . . . . . . . . . . . . . . . 24
Setpoints / Ramp generators P 100 - P 185 . . . . . . . . . . . . . . . . 26
Frequency characteristics P 200 - P 261 . . . . . . . . . . . . . . . . . . 26
Motor parameters P 310 - P 350 . . . . . . . . . . . . . . . . . . . . . . 27
Reference values P 400 - P 471 . . . . . . . . . . . . . . . . . . . . . . 27
Monitoring functions P 500 - P 572 . . . . . . . . . . . . . . . . . . . . 28
Terminal assignment P 600 - P 641 . . . . . . . . . . . . . . . . . . . . 29
Control functions P 710 - P 779 . . . . . . . . . . . . . . . . . . . . . . 30
Special functions P 800 - P 891 . . . . . . . . . . . . . . . . . . . . . . 31
Function bits and unit status . . . . . . . . . . . . . . . . . . . . . . . . 32
Fault memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
IPOS parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Appendix: Conversion list Index →Parameter . . . ..............36
Table of Contents
MOVITRAC
®
31.. Communications Interfaces and Parameter List 3
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1 Introduction
MOVITRAC®31.. frequency inverters of sizes 1 to 4 have two independent serial interfaces which
can be implemented with different SEW options to suit a variety of applications. The interfaces are
accessible through connectors X4 (for the operator control options) and X20 (for the option pcbs).
The functional independence of the interfaces provides a great degree of flexibility and a wide scope
of application. This allows a multitude of different communications concepts to be implemented.
MOVITRAC®31.. frequency inverters of size 0 have only one serial interface on connector X4.
Connector X20 is not available on these units.
Figure 1 below shows the options for operator control and serial communications.
Connector X4 for the operator control options is brought out as an RS-485 interface on the front
panel of the unit. It can accommodate the following options:
FGB31:
Keypad for adjustment of the frequency inverter parameters (except IPOS parameters/program) and
display of current process data. A FKG 31 extension cable is also available for the keypad.
FFI 31
FBG 31
USS 11A
(RS-232)
°°°°°
°°°°
UST 11A
(RS-485)
off
on
FEA 31
FIO 31
FFP 31
MOVITRAC
®
X4:
X20:
X20:
X20:
S2 S1X15:
H1
H2
H1
H2
H3
H4
H5
X10:X9:
100694AXX
Figure 1: Serial and user interface options with mounting positions shown
Introduction1
4 MOVITRAC
®
31.. Communications Interfaces and Parameter List
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USS 11A (Techn. data →Sec. 2.2.2):
Converts the internal signal level to RS-232 signal level. An automation unit (PLC) or a PC can be
connected to the 9-pin type D socket with a standard interface cable. This enables the user to set
parameters or control the inverter (e.g. with the MC_SHELL user interface).
UST 11A (Techn. data →Sec. 2.3.3):
Makes the RS-485 signals of the X4 interface accessible at the terminal strip of the UST 11A. The
main use of this option is to network up to 32 inverters via the X4 interface or to connect the inverter
to an automation unit (PLC) with an RS-485 interface.
The X20 option connector can accommodate the following options:
FEA 31..:
Offers the following additional I/Os: 1 analog input, 2 analog outputs, 4 binary inputs, 2 binary outputs
and a second RS-485 serial interface (terminals 67/68). This interface is mainly used to network
several inverters to a higher-level automation unit and to implement master-slave operation.
FIO 31..:
Offers the following additional I/Os: 7 binary inputs, 6 binary outputs and a second RS-485 serial
interface (terminals 67/68). This option is mainly used to extend the number of I/Os for applications
with the “IPOS positioning control” (FPI 31) option.
FFI 31..:
This option provides an InterBus-S interface to DIN 19258 specifications which offers fast process
data transfer and allows the inverter parameters to be set completely via InterBus-S. For a detailed
description of this option please refer to the appropriate manual.
FFP 31..:
This option provides a Profibus interface (DP, FMS slave) to DIN 19245 specifications which allows
the inverter to be controlled and parameters set completely via Profibus. For a detailed description
of this option please refer to the appropriate manual.
Important:
When communicating via the fieldbus interfaces (FFI 31/FFP 31) 1000dec must be added to each
index value.
This manual deals with the function and mode of operation of both serial interfaces. It discusses
the communications protocol in detail and provides examples to illustrate the use of the protocol
(→Sec. 2). It further includes the complete parameter list (→Sec. 4).
For a detailed description of the fieldbus interfaces and the fieldbus unit profile please refer to the
fieldbus documentation package, part number 0922 7210.
1Introduction
MOVITRAC
®
31.. Communications Interfaces and Parameter List 5
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2 Communications Interfaces
2.1 Mode of operation
The two serial interfaces (X4 and X20) allow the inverter to be completely parameterized. They further
offer the possibility of reading all internal and external states of the unit (actual values, terminal
signals) and of controlling the inverter. Both interfaces work independently of one another and have
equal priority. This means that if the inverter is parameterized via both interfaces at the same time,
the last value which is sent will be the one which is effective.
Both interfaces use the same transmission protocol. Communication is based on the master-slave
principle, whereby the higher-level control (PC, PLC) assumes the role of the master and the inverter
takes over the slave function. This means that the drive itself cannot initiate any transmission activity,
but can only respond to interrogation by the master. The master always has control of the
communications connection.
2.1.1 Communications protocol
The protocol was designed with regard to the following conditions:
•Shortest possible message lengths to achieve short response times
•Low implementation requirements and simple portability to other systems
•Transmission of unit-independent data formats
•Limitation of data integrity in favor of fast protocol execution
•Ability to increase amount of data to be transmitted to accommodate the expected functional
enhancement of the unit
•Acyclic, acknowledged data traffic to minimize time-related demands on the drive.
SELECT/
LONG_SELECT
ENQUIRY
ACK
NACK
NACK
MASTER SLAVE
1
2a
2b
3
4
5
LONG_DATA/
DATA
1. Send a parameter from the master to the slave
2. Acknowledge error-free receipt of the SELECT frame
2a. Error-free value transferred to system memory
or
2b. Value was not accepted for some reason
3. Request a value from the slave
4. Send the requested value to the master
or
5. Negative acknowledgement of request
(e.g. index cannot be assigned to any parameter)
200695AEN
Figure 2: The various message types in the protocol
Communications
Interfaces
2
6 MOVITRAC
®
31.. Communications Interfaces and Parameter List
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Figure 2 shows the execution principles of the communications protocol for the serial interfaces of
the inverter. Seven different message types (frames) are used which are recognized by their start
delimiters (SD):
Type of message SD Data service
ENQUIRY B5 hex Request parameter value
DATA C8 hex Acknowledgement with parameter value
LONG_DATA AC hex Acknowledgement with “long” parameter value (8 bytes)
SELECT A9 hex Write parameter value
LONG_SELECT AD hex Write “long” parameter value (8 bytes)
ACK (ACKNOWLEDGE) D2 hex Acknowledgement “understood”
NACK (NOT ACKNOWLEDGE) F3 hex Acknowledgement “not understood”
An individual parameter is addressed using the index assigned to it. This assignment is dealt with in
the Parameter List (→Sec. 4).
The message types are described in detail below.
2.1.1.1 ENQUIRY frame
The higher-level control system sends this frame to the inverter to read the value of the parameter
which is encoded in the index. Following error-free receipt the inverter responds with a DATA or
LONG_DATA frame. In the case of an error, it returns a NACK frame with the appropriate return code.
SD ADDR FCS
Index
Byte 0 1 2 3 4
SD
ADDR
Index
FCS
Start delimiter = B5
hex
Indicates the start of the frame
Address
Index
This number is in hexadecimal format.
Frame checksum
The checksum (FCS) is the sum of all previous bytes, without carry.
Contains a 16-bit number, which specifies the requested parameter.
Contains the target address (inverter address) of the frame.
300703AEN
Figure 3: ENQUIRY frame
2
Communications
Interfaces
MOVITRAC
®
31.. Communications Interfaces and Parameter List 7
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2.1.1.2 DATA frame
The MOVITRAC®31.. uses this frame to send the requested data in response to an ENQUIRY frame
of the higher-level control system.
2.1.1.3 LONG_DATA frame
The MOVITRAC®31.. uses this frame to send the requested data in 8-byte format in response to
an ENQUIRY frame of the higher-level control system.
SD Index
Byte 0 1 2 3 4
SD
Index
FCS
FCS
Value
567
Value
Start delimiter = C8
hex
Indicates the start of the frame
Index
Contains a 16-bit number, which specifies the requested parameter.
This number is in hexadecimal format.
Frame checksum
The checksum (FCS) is the sum of all previous bytes, without carry.
Value
Contains the value of a parameter.
400712AEN
Figure 4: DATA frame
SD
Index
FCS
Value
Byte
SD Index
0123 4 56
FCS
11
78910
Start delimiter = AC hex
Indicates the start of the frame.
Index
Contains a 16-bit number, which specifies the requested parameter.
This number is in hexadecimal format.
Frame checksum
The checksum (FCS) is the sum of all previous bytes, without carry.
Value
Contains the value of a parameter.
Value (8 bytes)
500713AEN
Figure 5: LONG_DATA frame
Communications
Interfaces
2
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®
31.. Communications Interfaces and Parameter List
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2.1.1.4 SELECT frame
The higher-level control system sends this frame to the inverter to overwrite a parameter in the unit.
After successful receipt, the MOVITRAC®31.. responds with an ACK frame or, in the case of an error,
with a NACK frame.
2.1.1.5 LONG_SELECT frame
The higher-level control system sends this frame to the inverter to overwrite an 8-byte parameter
in the unit. After successful receipt, the MOVITRAC®31.. responds with an ACK frame or, in the case
of an error, with a NACK frame.
SD Index
Byte 0 1 2 3 4
SD
Index
FCS
FCS
Value
567
Value
ADDR
8
ADDR
Start delimiter = A9
hex
Indicates the start of the frame.
Index
Contains a 16-bit number, which specifies the requested parameter.
This number is in hexadecimal format.
Frame checksum
The checksum (FCS) is the sum of all previous bytes, without carry.
Value
Contains the value of a parameter.
Address
Contains the target address (inverter address) of the frame.
600714AEN
Figure 6: SELECT frame
SD Index
Byte 0123 4
SD
Index
FCS
Value
5
ADDR FCS
11 12
ADDR
Value
Start delimiter = AD
hex
Indicates the start of the frame.
Index
Contains a 16-bit number, which specifies the requested parameter.
This number is in hexadecimal format.
Frame checksum
The checksum (FCS) is the sum of all previous bytes, without carry.
Value
Contains the value of a parameter.
Address
Contains the target address (inverter address) of the frame.
700715AEN
Figure 7: LONG_SELECT frame
2
Communications
Interfaces
MOVITRAC
®
31.. Communications Interfaces and Parameter List 9
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2.1.1.6 ACK (Acknowledge) frame
The inverter uses this frame to acknowledge error-free receipt of the SELECT frame.
2.1.1.7 NACK (Not Acknowledge) frame
This frame is used by the inverter following receipt of an ENQUIRY, SELECT or LONG_SELECT frame
to inform the higher-level control system that the requested service could not be carried out.
SD
Byte 0 1
SD
FCS
FCS
Start delimiter = D2
hex
Indicates the start of the frame.
Frame checksum
The checksum (FCS) is the sum of all previous bytes, without carry.
800716AEN
Figure 8: ACK frame
SD
Byte 0 1
SD
FCS
RC
RC
FCS
2
Start delimiter = F3
hex
Indicates the start of the frame.
Frame checksum
The checksum (FCS) is the sum of all previous bytes, without carry.
Return Code
Indicates the cause of the fault in coded form ( Sec. 2.1.2).→
900717AEN
Figure 9: NACK frame
Communications
Interfaces
2
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®
31.. Communications Interfaces and Parameter List
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2.1.2 Return codes (RC)
The table below lists the possible return codes (RC) in a NACK frame:
RC hex Meaning
10 Illegal index
11 Function/parameter not implemented
12 Read access only
13 Parameter lock (P 800) active
14 Factory setting (P 830) running
15 Parameter value too large
16 Parameter value too small
17 Necessary option pcb for function or parameter not installed
18 Fault in system software
19 Parameter access via this serial interface not permitted
1A Speed control (P 770) active
1B Unauthorized access
1C Output stage is not inhibited
1D Invalid parameter value (e.g. invalid intermediate value)
1E Factory setting was started
22 4Q operation 1 (P 890) required, e.g. for hoist function 1 (P 710)
23 4Q operation 2 (P 891) required, e.g. for hoist function 2 (P 712)
24 DC braking 1 (P 730) active; no change possible
25 DC braking 2 (P 733) active; no change possible
26 Hoist function set 1 (P 710) active; no change possible
27 Hoist function set 2 (P 712) active; no change possible
28 Parameter stored to volatile memory, lost on power-down
29 Parameter access via this serial interface not permitted
2A Speed control (P 770) inactive
2B Controller inhibit required
2C Motor size-up 1 (P 328) and rapid start 1 (P 720) cannot be activated at the same time
2D Motor size-up 2 (P 348) and rapid start 2 (P 723) cannot be activated at the same time
2E Necessary option pcb for function or parameter not installed
2F 4Q operation 1 (P 890) and DC braking 1 (P 730) cannot be activated at the same time
30 4Q operation 2 (P 891) and DC braking 2 (P 733) cannot be activated at the same time
31 Controller inhibit active; no change possible
32 Synchronous operation control (P 760) inactive
33 Synchronous operation control: MOVITRAC is slave (P 761)
34 Illegal message type
2
Communications
Interfaces
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®
31.. Communications Interfaces and Parameter List 11
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2.1.3 Application examples
The following examples illustrate the execution sequence of the protocol and the use of the associated
frames. All figures are in hexadecimal format.
2.1.3.1 Reading the parameter “Heat sink temperature” (P 001)
The application program installed on a PLC is required to evaluate the heat sink temperature of the
inverter with the address 12 for safety purposes. Thisaddress has previouslybeen set with the control
keypad.
The PLC (master) sends an ENQUIRY frame with the following format:
After error-free receipt of the ENQUIRY frame the MOVITRAC®replies with a DATA frame containing
the value for the heat sink temperature (25.5°C).
SD ADDR FCS
Byte 0 1 2 3 4
Index
B5 0C 00 04 C5
B5
0C
00 04
C5
Start delimiter (defined in the protocol)
Address of the axis module 0C = 12
hex dec
Index 0004 = heat sink temperature
hex
Checksum: B5 + 0C + 00 + 04 = C5
1000718AEN
Figure 10: Sending the ENQUIRY frame
SD
Byte 0123 4
C8
FCS
567
Index Value
C8 00 04 00 00 25 50 41
00 04
00 00 5025
41
Start delimiter (defined in the protocol)
Index 0004 = heat sink temperature
hex
Value 00002550 = 25.50 °C
Checksum: C8 + 00 + 04 + 00 + 00 + 25 + 50 = 41
1100719AEN
Figure 11: Replying with a DATA frame
Communications
Interfaces
2
12 MOVITRAC
®
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2.1.3.2 Writing the parameter “T11 RAMP UP” (P 120)
The PLC (master) is required to set the time for the first acceleration ramp (T11) to a value of
3.7 seconds. The following SELECT frame must be sent to the inverter for this purpose:
The inverter acknowledges error-free transfer of the value to the parameter memory with an ACK
frame.
SD
Byte 0 1 2 3 4
A9
FCS
567
ADDR
8
Index Value
A9 0C 00 19 00 00 7003 41
0C
00 19
00 00 03 70
41
Start delimiter (defined in the protocol)
Address of the axis module 0C = 12
hex dec
Index 0019 = T11 RAMP UP
hex
Parameter value (3.7 s)
Checksum: A9 + 0C + 00 + 19 + 00 + 00 + 03 + 70 = 41
1200720AEN
Figure 12: Sending the SELECT frame
Byte 0
SD FCS
1
D2D2
D2
D2
Start delimiter (defined in the protocol)
Checksum: D2 = D2
1300721AEN
Figure 13: Replying with an ACK frame
2
Communications
Interfaces
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®
31.. Communications Interfaces and Parameter List 13
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2.2 The RS-232 interface
2.2.1 Connecting the MOVITRAC®31.. to a PC
The RS-232 serial connection between a MOVITRAC®31.. and a PC (or a higher-level control system)
is made with the USS 11A interface option, which is plugged into the X4 connector on the front of
the unit. The interface has a 9-pin type D socket of which only 3 connections (pins 2, 3, 5) are used.
The other pins are not connected. Figure 14 shows a schematic of the connector pinout.
The units are connected with a commercial RS-232 cable (9-pin type D connector to 9-pin type D
connector). Connections 2 and 3 are the data lines. Pin 5 is the ground connection for the units.
Figure 15 shows the physical signal levels of the interface lines TxD (transmit data) and RxD (receive
data).
RxD
TxD
2
3
5
2
3
5GND (ground)
Connection to PC (COM1, COM2)Connection to USS 11A (MOVITRAC )
®
max. 5 m
9-pin type D connector (female)9-pin type D connector (male)
1400722AEN
Figure 14: Interface cable between the MOVITRAC
®
31.. and the PC
+10 V
-10 V
+10 V
-10 V
time
time
TxD-
signal
from PC,
PLC etc.
RxD-
signal
from PC,
PLC etc.
PC sends Data
MOVITRAC
®
sends response
MOVITRAC response time
®
(depends on program execution time and P 843)
1500723AEN
Figure 15: Signal levels of the interface leads
Communications
Interfaces
2
14 MOVITRAC
®
31.. Communications Interfaces and Parameter List
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SEW-EURODRIVE provides a powerful tool in the form of the MC_SHELL PC program, which is
specially designed for parameter setting of MOVITRAC®frequency inverters via PC.
A communications processor which provides the functionality of an RS-232 interface is required for
the connection to a PLC. SIEMENS, for example, offers the CP 523 serial communications module
for the SIMATIC®S5.
2.2.2 Technical data of the MOVITRAC®RS-232 interface
•Standard . . . . . . . . . . . . . . . . . DIN 66020 (V.24) and RS-232
•Baud rate . . . . . . . . . . . . . . . . . 9600 baud
•Start bits . . . . . . . . . . . . . . . . . 1 start bit
•Stop bits . . . . . . . . . . . . . . . . . 1 stop bit
•Data bits . . . . . . . . . . . . . . . . . 8 data bits
•Parity . . . . . . . . . . . . . . . . . . . none
•Data direction . . . . . . . . . . . . . . . bidirectional
•Operating mode . . . . . . . . . . . . . . asynchronous, half-duplex
•Max. cable length . . . . . . . . . . . . . 5 m or 16.5 ft
•Number of stations . . . . . . . . . . . . 1 master (PC/higher-level control system) +
slave (MOVITRAC®)
SIMATIC
®
is a registered trademark of SIEMENS AG
2
Communications
Interfaces
MOVITRAC
®
31.. Communications Interfaces and Parameter List 15
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2.3 The RS-485 interface
The RS-485 interface is available on terminals 67/68 of the UST 11A option (plugs into X4) and on
the FEA 31.. and FIO 31.. options (plugs into X20).
These interfaces have two principal functions:
1.Networking of an automation unit with several inverters.
2. Master-slave operation with 2 or more MOVITRAC®31 units.
Only available in combination with the FEA 31/FIO 31, not the UST 11A.
Note:
The terminating resistor is already provided on the FEA 31.., FIO 31.. and UST 11A options and must
not be connected externally.
2.3.1 Networking the MOVITRAC®31..
Simultaneous acquisition or alteration of the process states or the parameter setting of several
inverters from an automation unit requires internetworking these units with the possibility of
addressing each of them individually.
The unit addresses for the individual MOVITRAC®31.. inverters must be set separately by using the
menu in the FBG 31 control keypad before commissioning the network. It must be ensured that each
unit has unique address assigned to it from the 64 possible addresses. If two or more units have the
same address then bus conflicts and resulting data loss are unavoidable.
The physical characteristics of the RS-485 interface only permit single-master operation, i.e. only
one station in the network can have permission to send, i.e. be the master, at any particular time.
2.3.2 Master-slave operation
An additional protocol has been implemented which offers the user the possibility of master-slave
operation of several inverters via an RS-485 network. To achieve this the inverters are connected in
parallel, as shownin Figure 17below. The appropriate settings are then madein the menu todetermine
which inverter takes over the role of master (setpoint source). All other units work as slaves.
MOVITRAC MOVITRAC MOVITRAC
FEA 31
FIO 31
FEA 31
FIO 31
FEA 31
FIO 31
Master Slave Slave Slave
ADDR. 1 ADDR. 2 ADDR. 3
1600724AEN
Figure 16: Networking the MOVITRAC
®
31..
Communications
Interfaces
2
16 MOVITRAC
®
31.. Communications Interfaces and Parameter List
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The setpoint given by the mastercan be scaled with a factor between 0.1and 10.0 and thus individually
adapted for each slave. After master-slave operation has been activated on all the inverters, the master
starts to send out the setpoint cyclically. The setpoint is transmitted simultaneously and without
acknowledgement to all slaves. This means that the master does not have any information about
which slaves have actually received the setpoint without any errors, and which have not. If an inverter
is selected as a slave, then all other internal and external setpoint references become ineffective.
The setpoint which is provided by the master can have various origins:
- a setpoint which is specified to the master via a fieldbus
- an external or internal setpoint
- a setpoint from the RS-232 interface (USS 11A)
Notes:
1. In order to guarantee secure data transmission, it is necessary to ensure that only one inverter
in the network takes over the master function.
2. Communication between a PC and an inverter via the RS-485 interface (UST 11A, FEA 31, FIO 31)
is not possible when master-slave operation is activated. The PC must be disconnected from the
master-slavenetwork!
3. The address which is set has no effect in this mode of operation. The setpoint goes to all the
slave units.
2.3.3 Technical data of the MOVITRAC®RS-485 interface
•Standard . . . . . . . . . . . . . . . . . RS-485
•Baud rate . . . . . . . . . . . . . . . . . 9600 baud
•Start bits . . . . . . . . . . . . . . . . . 1 start bit
•Stop bits . . . . . . . . . . . . . . . . . 1 stop bit
•Data bits . . . . . . . . . . . . . . . . . 8 data bits
•Parity . . . . . . . . . . . . . . . . . . . none
•Data flow . . . . . . . . . . . . . . . . . bidirectional
•Operating mode . . . . . . . . . . . . . . half-duplex, asynchronous
•Terminating resistor . . . . . . . . . . . already fitted
•Max. cable length . . . . . . . . . . . . . 200 m or 660 ft between 2 stations
•Number of stations . . . . . . . . . . . . 1 master + max. 31 slaves
MOVITRAC MOVITRAC MOVITRAC
MASTER SLAVE SLAVE
FEA 31
FIO 31
FEA 31
FIO 31
FEA 31
FIO 31
Speed setpoint
1700725AEN
Figure 17: Master-slave operation via RS-485
2
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MOVITRAC
®
31.. Communications Interfaces and Parameter List 17
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2.4 Communicating with a PLC
For a PLC and a MOVITRAC®31.. unit to communicate, fit the PLC with a communications module
(communications processor, CP) which allows the transmission protocol to be freely programmed.
In the case of the SIMATIC®S5, for example, you may use the CP523 module to link the MOVITRAC®
31.. frequency inverter to the PLC via the RS-232 interface. This communications module supports
the communications mode “transparent”, i.e. the protocol to be transmitted can be freely program-
med by the user.
Transfer of parameter settings see the Siemens CP523 communications module manual.
2.4.1 System requirements
To establish a communications link between a SIMATIC®S5 and the MOVITRAC®31.. frequency
inverter using the RS-232 serial interface you will need the following hardware components:
1 MOVITRAC®31..
1 USS 11A
1 communications module CP523 for the S5-series
1 interface cable (see Figure 18)
SIMATIC
®
is a registered trademark of SIEMENS AG
RxD
TxD
2
3
5
2
5
11
25
24
GND (ground)
Connection to CP523
Connection to USS 11A (MOVITRAC )
®
25-pin type D connector (male)
9-pin type D connector (male)
1800726AEN
Figure 18: Interface cable between a MOVITRAC
®
31.. and a CP523
Communications
Interfaces
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18 MOVITRAC
®
31.. Communications Interfaces and Parameter List
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2.4.2 Initializing the PLC module CP523 in the user program
In the communications mode the CP523 communications processor allows up to 256 bytes to be
transmitted with a CPU request. In the communications mode “transparent” the CP523 does not
interpret any characters. All data transmitted with a send request are therefore directly output on the
interface. At the same time the CP523 stores all data received directly in the receive buffer allowing
the received data to be picked up with the appropriate CPU request.
As the length of the frames used for communication with the MOVITRAC®31.. frequency inverter
varies, the maximum frame length must be set to accommodate the longest possible frame
(LONG_SELECT frame = 13 bytes).
To initialize the communications interface, a parameter block is transmitted to the CP523. You may
use the CPU request “Transfer parameter data” to do this. The following tables show the settings for
these parameter blocks which are used to initialize communication with the MOVITRAC®31
frequency inverter.
Transfer buffer assignment for parameter block 0:
Byte Meaning Value for MOVITRAC®31..
0Request no. “Transfer parameter data” 90 hex
1Parameter block no. 00 hex
2Baud rate: 9600 baud 08 hex
3Parity check: No check 04 hex
4Busy signal: NO 00 hex
5Interface: V.24 01 hex
6Data format: 10 bits, 1 start bit + 8 data bits+1stopbit 05hex
7Hardware handshake. OFF 00 hex
Transfer buffer assignment for parameter block 7:
Byte Meaning Value for MOVITRAC®31..
0Request no. “Transfer parameter data” 90 hex
1Parameter block 7, communications mode “transparent” 71 hex
2+3 Character delay time: 10 ms 0001 hex
4+5 Max. frame length: 13 bytes 000D hex
6+7 No function 0000 hex
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®
31.. Communications Interfaces and Parameter List 19
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2.4.3 Example: Reading the parameter “Heat sink temperature” (P 001)
To read out the heat sink temperature of a frequency inverter with the address 0, the CP523 is to
send an ENQUIRY frame to the inverter. The transfer buffer and the transfer procedure are as follows:
1. CP523 initialization: “Send frame” (A001 hex) with a data length = 5 bytes
(since the ENQUIRY frame is 5 bytes long).
2. Transfer of the send data in the transfer buffer to the CP523.
Transferring the ENQUIRY frame to the CP523:
Byte Meaning Value for MOVITRAC®31..
0Start delimiter SD B5 hex
1Address: 0 00 hex
2+3 Index of the parameter “heat sink temperature” 0004 hex
4Checksum = B5 + 00 + 00 + 04 = B9 00B9 hex
5-7 No function 00 hex
3. The CP523 automatically sends the ENQUIRY frame to the inverter.
4. The CP523 automatically receives the DATA frame from the inverter and stores it in the
receive buffer.
5. The contents of the receive buffer are transferred to the user program with the CPU request
“Receive frame” (A080 hex). The transfer buffer now contains the DATA frame.
Contents of the transfer buffer after receiving the DATA frame:
Byte Meaning Value for MOVITRAC®31..
0Start delimiter SD C8 hex
1+2 Index of the parameter “heat sink temperature” 0004 hex
3+4 More significant part of the parameter value e.g. 0000 hex
5+6 Less significant part of the parameter value e.g. 2550 hex
7Checksum = C8 + 00 + 04 + 00 + 00 + 25 + 50 = 41 41 hex
6. The checksum in byte 7 of the receive buffer is then evaluated. If the recalculated checksum
corresponds to the checksum in byte 7, the frame was received correctly. If not, the read
process must be repeated.
In the above example a heat sink temperature of 25.5°C was read out.
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20 MOVITRAC
®
31.. Communications Interfaces and Parameter List
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