Lenze AC Tech SC Series User manual

SCF Series Drives
Modbus Communications Reference Guide

This documentation applies to the use of an SCF Series Variable Frequency Drive in a Modbus Network and should
be used in conjunction with the SCF Series Installation and Operation Manual (Document SF01) that shipped with
the drive. These documents should be read in their entirety as they contain important technical data and describe
the installation and operation of the drive.
© 2003 Lenze AC Tech Corporation
No part of this documentation may be copied or made available to third parties without the explicit written approval
of Lenze AC Tech Corporation. All information given in this documentation has been carefully selected and tested
for compliance with the hardware and software described. Nevertheless, discrepancies cannot be ruled out. Lenze
AC Tech does not accept any responsibility nor liability for damages that may occur. Any necessary corrections will
be implemented in subsequent editions.
About These Instructions

i RG-SFMOD
Contents
1 Safety Information.............................................................................................................1
1.1 Warnings, Cautions and Notes ..............................................................................1
1.1.1 General ....................................................................................................1
1.1.2 Application ...............................................................................................1
1.1.3 Installation ...............................................................................................1
1.1.4 Electrical Connection................................................................................2
1.1.5 Operation .................................................................................................2
1.2 Reference and Links .............................................................................................2
2 Introduction.......................................................................................................................3
2.1 Modbus Details.....................................................................................................3
2.2 Universal Registers ...............................................................................................4
3 Data Representation - Internal and External.......................................................................5
3.1 Register Format ....................................................................................................5
3.2 Data Types ...........................................................................................................5
3.3 AC Tech Drive Registers........................................................................................5
4 SCF Drive Setup & Operation.............................................................................................6
4.1 Serial Address ......................................................................................................6
4.2 Serial Communications Parameter ........................................................................6
4.3 Control Parameter.................................................................................................6
4.4 Unlocking & Locking Controls ...............................................................................7
4.5 Unlocking & Locking Programming Parameters only .............................................7
4.6 Watchdog Timer ...................................................................................................8
4.7 Monitoring Only Operation ....................................................................................8
4.8 Normal Control Operation Sequence .....................................................................8
4.9 Start/Stop, Speed Control and Parameter Change Operation .................................9

RG-SFMOD ii
Contents
5 SCF Drive Control Registers...............................................................................................10
5.1 Abbreviations........................................................................................................11
5.2 Drive Control - Register #1....................................................................................11
5.3 Drive Hardware Configuration - Register #22 ........................................................12
5.4 Drive Status - Registers #24-29............................................................................13
5.4.1 Reading Register #24...............................................................................13
5.4.2 Operational Status - Register #26.............................................................14
5.4.3 Actual Rotational Direction - Registers #24 & 27 ......................................14
5.4.4 Control Mode - Registers #24 & 27 ..........................................................14
5.4.5 Speed Command Source - Registers #24 & 28.........................................15
5.4.6 Auto/Manual Status - Registers #24 & 28.................................................15
5.4.7 Present Fault - Registers #24 & 29...........................................................16
5.4.8 Commanded Rotational Direction - Registers #24 & 29 ............................16
5.5 Motor Volts - Register #30 ....................................................................................17
5.6 Keypad Speed - Register #40 ...............................................................................17
5.7 Unlock Commands - Register #48.........................................................................17
5.8 Unlock Parameters - Register #49 ........................................................................17
5.9 Register Version....................................................................................................17
6 SCF Programming Parameters ..........................................................................................18
6.1 Format..................................................................................................................18
6.2 Parameter List ......................................................................................................19
7 Quick Start Instructions .....................................................................................................25
7.1 Initial Settings.......................................................................................................25
7.2 Drive Control.........................................................................................................26
7.3 Basic Drive Commands.........................................................................................26
7.4 Basic Drive Status.................................................................................................27
7.5 Basic Drive Network Programming........................................................................27

1 RG-SFMOD
Safety Information
1 Safety Information
1.1 Warnings, Cautions and Notes
1.1.1 General
Some parts of Lenze controllers (frequency inverters, servo inverters, DC controllers) can be live, moving
and rotating. Some surfaces can be hot.
Non-authorized removal of the required cover, inappropriate use, and incorrect installation or operation
creates the risk of severe injury to personnel or damage to equipment.
All operations concerning transport, installation, and commissioning as well as maintenance must be
carried out by qualified, skilled personnel (IEC 364 and CENELEC HD 384 or DIN VDE 0100 and IEC report
664 or DIN VDE0110 and national regulations for the prevention of accidents must be observed).
According to this basic safety information, qualified skilled personnel are persons who are familiar with
the installation, assembly, commissioning, and operation of the product and who have the qualifications
necessary for their occupation.
1.1.2 Application
Drive controllers are components designed for installation in electrical systems or machinery. They are
not to be used as appliances. They are intended exclusively for professional and commercial purposes
according to EN 61000-3-2. The documentation includes information on compliance with EN 61000-3-2.
When installing the drive controllers in machines, commissioning (i.e. the starting of operation as directed)
is prohibited until it is proven that the machine complies with the regulations of the EC Directive 98/37/EC
(Machinery Directive); EN 60204 must be observed.
Commissioning (i.e. starting drive as directed) is only allowed when there is compliance to the EMC
Directive (2004/108/EC).
The drive controllers meet the requirements of the Low Voltage Directive 2006/95/EC. The harmonised
standards of the series EN 50178/DIN VDE 0160 apply to the controllers.
The availability of controllers is restricted according to EN 61800-3. These products can cause
radio interference in residential areas. In the case of radio interference, special measures may be
necessary for drive controllers.
1.1.3 Installation
Ensure proper handling and avoid excessive mechanical stress. Do not bend any components and do not
change any insulation distances during transport or handling. Do not touch any electronic components
and contacts. Controllers contain electrostatically sensitive components, which can easily be damaged by
inappropriate handling. Do not damage or destroy any electrical components since this might endanger
your health! When installing the drive ensure optimal airflow by observing all clearance distances in the
drive's user manual. Do not expose the drive to excessive: vibration, temperature, humidity, sunlight, dust,
pollutants, corrosive chemicals or other hazardous environments.

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Safety Information
1.1.4 Electrical Connection
When working on live drive controllers, applicable national regulations for the prevention of accidents (e.g.
VBG 4) must be observed.
The electrical installation must be carried out in accordance with the appropriate regulations (e.g.
cable cross-sections, fuses, PE connection). Additional information can be obtained from the regulatory
documentation.
The regulatory documentation contains information about installation in compliance with EMC (shielding,
grounding, filters and cables). These notes must also be observed for CE-marked controllers.
The manufacturer of the system or machine is responsible for compliance with the required limit values
demanded by EMC legislation.
1.1.5 Operation
Systems including controllers must be equipped with additional monitoring and protection devices according
to the corresponding standards (e.g. technical equipment, regulations for prevention of accidents, etc.).
You are allowed to adapt the controller to your application as described in the documentation.
DANGER!
• After the controller has been disconnected from the supply voltage, do not touch the live components and power
connection until the capacitors have discharged. Please observe the corresponding notes on the controller.
• Do not continuously cycle input power to the controller more than once every three minutes.
• Close all protective covers and doors during operation.
WARNING!
Network control permits automatic starting and stopping of the inverter drive. The system design must incorporate adequate
protection to prevent personnel from accessing moving equipment while power is applied to the drive system.
Table 1: Pictographs used in these instructions
Pictograph Signal word Meaning Consequences if ignored
DANGER! Warning of Hazardous Electrical
Voltage.
Reference to an imminent danger that may
result in death or serious personal injury if the
corresponding measures are not taken.
WARNING! Impending or possible danger
for persons
Death or injury
STOP! Possible damage to equipment Damage to drive system or its surroundings
NOTE Useful tip: If observed, it will
make using the drive easier
1.2 Reference and Links
SCF Series Variable Frequency Drives visit: http://www.lenze-actech.com
Modbus-IDA visit: http://www.modbus-IDA.org

3 RG-SFMOD
Introduction
2 Introduction
This document defines the specifics required for Modbus serial communication with a Lenze-AC Tech
standard SCF Series drives for control, status monitoring, and programming parameters. A familiarity
with normal drive capabilities and operations is assumed. If this is not the case, refer to the SCF Series
Installation and Operation manual (SF01) for more information.
2.1 Modbus Details
A. AC Tech Drives running the Modbus communication protocol use the RTU (Remote Terminal Unit)
transmission mode and are slaves only. Therefore, the device communicating with the drives must be
a Modbus Master. The baud rate is 9600, no parity (two stop bits). There are provisions for Odd parity
1 stop bit and Even parity 1 stop bit as well. The bit sequence is:
DATA
Start bit 1 2 3 4 5 6 7 8 Stop bit Stop bit
B. At this time the AC Tech drives do not support the broadcast function of the protocol.
C. IMPORTANT NOTE: Modbus 3X and 4X Registers are numbered starting at 1. However, when
transmitted to a slave over the serial link, the actual address transmitted is one less. This is because
the addresses are numbered starting from 0. AC Tech register numbers are also numbered starting
from 0. Therefore, AC Tech register numbers always correspond exactly with the address transmitted.
As a result, MODBUS REGISTER NUMBERS ARE ALWAYS ONE GREATER THAN AC TECH REGISTER
NUMBERS. WHENEVER THE WORDS “REGISTER #xx” APPEAR, IT SHOULD BE ASSUMED THAT THEY
MEAN “AC TECH REGISTER xx” and the Modbus Register number will be one larger. In some instances
we may show both for clarity. For example: “Register #24 (Modbus Register #25) . . .”
D. The function codes supported by AC Tech drives are:
03 Read Holding Registers (4X references). In general we can read only one register at a time. However,
there are a few limited exceptions.
Exception One:
Register #24 (Modbus Register #25) Drive Status, can also be read as a group of 6 words.
Exception Two:
AC Tech uses a method of reading a group of related registers that may not be consecutive within
the drive memory map. When this is done for the registers below, the response from the drive will
be for the number of words requested but will not be with consecutive registers.
Register #100 (Modbus Register #101), Fault history, should be read as a group of 4 words.
Register #101 (Modbus Register #102), Software version, should be read as a group of 4 words.
04 Read Input Registers (3X references). As with function 03, we read one register at a time except
where noted.

RG-SFMOD 4
Introduction
06 Preset Single Register (4X references). Write single register.
16 Preset Multiple Registers (4X references). Although the function is for multiple registers, we will
accept only a single register to be written.
Note: Since we do not differentiate between 4X and 3X references, function codes 03 and 04 are
treated identically.
E. Exception codes:
01 - Command rejected, Illegal function
02 - No such register
03 - Data out of range
04 - Wrong data format
06 - Slave device busy. Registers cannot be written while the drive is in keypad programming mode.
F. The AC Tech drive will most nearly conform to the Modicon®Micro 84 in capabilities. This may be of
importance when configuring networks for DDE Servers.
G. Modbus®and Modicon®are registered trademarks of Schneider Electric. For more information about
the Modbus Protocol please refer to the Modicon Modbus Protocol Reference Guide. Web resources:
http://www.Modbus-IDA.org and http://www.schneider-electric.com.
2.2 Universal Registers
Lenze-AC Tech manufactures several drive families. Currently the QC, MC, MCH, SC, TC, smd , Tmd and SMV
Series drives support Modbus based communications. Since each drive family has different parameters
and size ranges, the parameter (register) definitions are in many cases quite different. In order to facilitate
communication in a network with a mix of drive types, certain AC Tech Register locations have been made
universal among AC Tech drives. While their locations are consistent, their contents may vary as defined
in Table 2.
Table 2: Contents of Universal Registers
AC Tech Reg # Function
1 Drive Control (WRITE ONLY). Not all drives will have all control functions but when the function is
available it will be at a defined bit location within Register #1. Drive Family and register Configuration
Number dependent.
19 Drive Family (READ ONLY) This register is CONSISTENT AMONG ALL AC TECH DRIVES:
- 64 -- QC family - 67 -- - 70 -- TCF family
- 65 -- MC family - 68 -- MCH family - 71 --
Tmd family
- 66 -- SCF family - 69 -- smd family - 72 -- SMV family
21 Drive Size (READ ONLY). Code to identify Power (HP/KW) and Line Voltage of the drive. Family
dependent. For the SC series it always reads zero.
24 Drive Status (READ ONLY). Various operational variables.
48 Unlock Control (WRITE ONLY).
49 Unlock Writing of registers (WRITE ONLY).
50 Parameter Configuration Number (READ ONLY).

5 RG-SFMOD
Data & Register Format
3 Data Representation - Internal and External
3.1 Register Format
All registers are 16 bits. The data within these registers can take on the following forms:
• Individual bit commands (16 per register).
Example: Register #1 (Modbus Register #2).
• Individual bit flags (16 per register).
Example: Register #22.
• A chain of two 8 bit unsigned integers.
• A 16 bit unsigned integer.
This unsigned integer could in turn represent many different types of data with various scaling
rules and units, which are defined by the DATA TYPE of the register.
3.2 Data Types
Data passed in registers across the Modbus communications link are always in INTERNAL units. The drive
itself may show the information in alternate DISPLAYED units. For Example: drive speeds are always stored
internally as tenths of a Hz but the drive may display that speed in whole Hz by dropping the tenth using
programmed conversion factors. Table 3 lists examples of the internal units used on the SCF series.
Table 3: SCF Series Internal Units
Type Unit Example
SPEED .1Hz 60Hz = 600
TIME .1Sec 30.0Sec = 300
3.3 AC Tech Drive Registers
Registers #0 through #50: (Modbus Registers #1 to #51) Reserved for configuration and control
Registers #51 through #255 (Modbus Registers #52 to #256) Reserved for the drives’ programming
mode parameters. Programming Mode Parameters are the parameters
that can be accessed from the local keypad on the drive. There is a direct
correspondence between the SCF Drive Programming Mode Parameter
number and the AC Tech Register number (and consequently, the
Modbus register number):
AC Tech Register # = (SCF Programming Parameter #) + 50
Modbus Register # = (SCF Programming Parameter #) + 51
The entries in Table 5 are based on SCF Drive Software # 213-064 Revision 03 (Parameter Configuration =
312). If a later revision of software were to change register definitions, drive operation could be seriously
affected. This will be identified for a given drive by examining Register #50 (Parameter Configuration
Number). The number displayed at power up on drive display can also identify it. If it is not 312, writing to
any register on the drive MUST NOT BE ATTEMPTED unless your Controller has been setup to support the
new configuration.

RG-SFMOD 6
Drive Setup & Operation
4 SCF Drive Setup & Operation
4.1 Serial Address
All AC Tech drives have a Serial Address Parameter that must be programmed prior to attempting to
operate the serial interface (Programming Parameter #43 / AC Tech Register #93).
4.2 Serial Communications Parameter
All AC Tech drives have a Serial Communications Parameter that governs the operation of the Serial Link.
On SCF drives this is #15 SERIAL LINK (register #65). Table 4 lists the selections for SC Parameter 15,
SERIAL LINK.
Table 4: SCF Parameter 15 Selections
Setting Description Watchdog Timeout Period
1 DISABLE
2 9600,N,2 WITH TIMER 10 sec
3 9600,N,2 WITHOUT TIMER
4 9600,E,1 WITH TIMER 10 sec
5 9600,E,1 WITHOUT TIMER
6 9600,O,1 WITH TIMER 10 sec
7 9600,O,1 WITHOUT TIMER
Explanation of Terms:
• DISABLED serial link not operational
• WITH TIMER serial link allows reading & writing of both control & programming parameters.
Watchdog timer is enabled (refer to section 4.6, Watchdog Timer ).
• WITHOUT TIMER serial link allows reading & writing of both control & programming parameters.
Watchdog timer is disabled (refer to section 4.6, Watchdog Timer ).
The Serial Communications Parameter must be appropriately programmed prior to attempting to
communicate with the drive.
4.3 Control Parameter
Programming parameter #14 (control) must be programmed to 01 (terminal strip only). Serial operation will
not work correctly if 02 (remote keypad only) or 03 (terminal strip or remote keypad) are selected.

7 RG-SFMOD
Drive Setup & Operation
4.4 Unlocking & Locking Controls
Registers #48 and #1 are used in Unlocking and Locking Controls.
• A write to Register #48 (Unlock Controls) with a value of 0 will unlock controls. This enables the writing
of Register #1 – the Drive Control Register and register #40 (keypad speed command).
Note: Terminal TB1 must be asserted in order to unlock serial control.
• If Register #48 (Unlock Controls) is written with a value that is the Drive’s Programming Password, then
in addition to Register #1(Drive Control), writing to all other writeable registers is enabled (e.g.: register
#81 -- Preset Speed #1). The factory default password for SCF series drives is 225.
• Once Register #48 (Unlock Controls) has been written, Controls are unlocked until Register#1 bit 1
(Lock Bit) has been written, Watchdog Timeout occurs or terminal TB1 is opened.
• Writing to Register #1 (Drive Control) with bit 1 set will Lock both Controls and Parameters (prevents
writing to any register).
• The serial drive control can be unlocked only if terminal TB1 is asserted and the drive is not in
programming mode.
• When LOCK is asserted, the drive drops out of SERIAL control and reverts back to the previous source
of control.
• Even though drive might be locked, and thus parameters and control cannot be written, parameters
and status can always be read. Refer to section 4.7,
Monitoring Only Operation .
4.5 Unlocking & Locking Programming Parameters only
Registers #49 and #1 are used in Unlocking and Locking Programming Parameters.
• Writing to any writeable register other than #1 and #40 (keypad speed) can be enabled by writing the
Drive’s Programming Password to Register #49 (Unlock Parameters). This would be done when Drive
Control (start, stop, etc.) and keypad speed control (reg.#40) is not required.
• The Factory Default password is 225.
• Once Register #49 (Unlock Parameters) has been written, the writing of parameter registers is unlocked
until Register #1bit 1 (Lock Bit) has been set.

RG-SFMOD 8
Drive Setup & Operation
4.6 Watchdog Timer
All AC Tech drives are equipped with a Serial Link “Watchdog Timer”. If the Modbus Master wishes to
control the drive (start, stop, forward, reverse, etc.) it must first “Unlock Controls” (refer to section 5.7).
If the Watchdog Timer is enabled and controls have been unlocked, the Master MUST PERIODICALLY
COMMUNICATE with the drive or the timer will timeout. Communications should typically be done at less
than 5 sec intervals as the watchdog timer faults at 10 seconds. A Watchdog timeout forces the drive
to stop because it is assumed that the failure of periodic communications with the drive could be a loss
of the serial link with the accompanying loss of ability to command the drive to stop. The Watchdog
Timer does not operate unless Controls have been UNLOCKED via Register #48, or parameters writing has
been unlocked via Register #49. In case of unlocking parameters only, watchdog timer will disable write
permission but will not stop the drive.
Watchdog Timer Controls
− For some applications, it is inappropriate to shut down the drive because of a Watchdog Timeout.
Therefore, we have provided a means of disabling the Watchdog using Programming Parameter
#15 (SERIAL LINK):
Programming Parameter #15 controls both the enabling of the serial link and the Watchdog.
By setting Parameter #15 to one of the selections WITH TIMER enables the serial link WITH the
Watchdog. Conversely, setting Parameter #15 to WITHOUT TIMER enables the serial link WITHOUT
the Watchdog.
− If the Watchdog Timer has been disabled, the Unlock Control Register #48 or Unlock Writing
Register #49 must still be asserted in order to write to Register #1 (Drive Control) or to any of
the programming parameters (in case of unlocking writing). However, there are no longer any
constraints on how often the Master must communicate with the drive.
4.7 Monitoring Only Operation
1. Power up drive in TERMINAL mode with serial enabled.
2. Simply read AC Tech Register #24 (Modbus Register #25) or any other readable register.
3. No unlocking or watchdog issues apply for monitoring.
4.8 Normal Control Operation Sequence
1. Power up the drive with serial enabled and TB1 asserted.
2. Unlock control by writing a zero to Register #48.
3. Control drive operation via various commands to Register #1 (Start, Stop, Reverse direction, etc.) and
change the keypad command speed by writing to Register #40.
Note: Drive must be in “MANUAL” (see Register #1 [drive control]) and Parameter #5 (standard speed
source) must be set to 01 (keypad) in order to control speed via Register #40.

9 RG-SFMOD
Drive Setup & Operation
4. If the Watchdog Timer is enabled, keep it from timing out by ensuring that repeated reads of drive
status (Register #24 – 6 registers) are performed at reasonable intervals (typically less than 5 seconds
between reads because the Watchdog typically faults at 10 seconds).
5. Lock Control when drive operations are complete by writing a 2 to Register #1 (assert bit 1 of Register
#1).
6. Drive is now returned to TERMINAL mode (control from the drive’s terminal).
4.9 Start/Stop, Speed Control and Parameter Change Operation
The typical sequence for a Start/Stop, Speed Control or Parameter Change operation is listed herein.
1. Power up drive with serial enabled and TB1 asserted.
2. Unlock Controls and Parameters by writing the current programming password (default 225) to Register
#48.
3. Set parameter #5 (standard speed source) to 01 (keypad), and put drive in MANUAL mode so that it
responds to speed commands from the Keypad Speed Command register. This is done by sending
0200 hex to Register #1 (bit 9 asserted).
4. Control Drive Operation via various commands to Register #1 (Start, Stop, Reverse direction, etc.).
5. Control Drive Speed by writing the Speed Commands to Register #40 (Keypad Speed Command).
6. Change the programming parameters (e.g., change the acceleration rate by writing new acceleration
rate to register #69)
7. If the Watchdog Timer is enabled, keep it from timing out by insuring that repeated reads of any of the
registers are performed at reasonable intervals (typically less than 5 seconds between reads because
the Watchdog typically faults at 10 seconds). Note: It is suggested that the drive status register (#24)
be used for this function.
8. Lock Controls and Parameters when drive operations are complete by writing a 2 to Register #1 (assert
bit 1 of Register 1).
9. Drive is now returned to TERMINAL mode (control from the drive’s terminal).

RG-SFMOD 10
Drive Control & Communication
5 SCF Drive Control Registers
Table 5 describes the SCF Drive Control Registers in ascending order of AC Tech Register #. The HEX
representation is given in parenthesis next to the AC Tech Register # in the left-most column.
Table 5: SCF Drive Control Registers
AC Tech Register # (HEX representation)
REGISTER NAME
R/W/RS
MESSAGE MIN MAX UNITS
[NOTE]
or
Section
1 (01) Drive Control W SA 06 00 01 DH DL CRC Refer to Section 5.2 [1]
RS SA 06 00 01 DH DL CRC
19 (13) Drive Family R SA 03 00 13 00 01 CRC Refer to Section 5.2 [2]
RS SA 03 02 00 42 CRC
21 (15) Drive Size R SA 03 00 15 00 01 CRC Refer to Section 5.2 [3]
RS SA 03 02 00 00 CRC
22 (16) Drive H/W R SA 03 00 16 00 01 CRC Refer to Section 5.3
RS SA 03 02 DH DL CRC
24 (18)
Drive Status
(6 register read)
(reg. #24 to 29)
R SA 03 00 18 00 06 CRC
Refer to Section 5.4
RS SA 03 0C D1H D1L D2H D2L
D3H D3L D4H D4L
D5H D5L D6H D6L CRC
24 (18) Command Speed R SA 03 00 18 00 01 CRC 0 2400 0.1 Hz [4a]
RS SA 03 02 DH DL CRC
25 (19) Actual Speed R SA 03 00 19 00 01 CRC 0 2400 0.1 Hz [4b]
RS SA 03 02 DH DL CRC
26 (1A) Load (DH) /
Status (DL)
R SA 03 00 1A 00 01 CRC Refer to Section 5.4.2 [4c]
RS SA 03 02 DH DL CRC
27 (1B) Actual Rot. Direction (DH)/
Control Mode (DL)
R SA 03 00 1B 00 01 CRC Refer to Section 5.4.3/4
RS SA 03 02 DH DL CRC
28 (1C) Speed Source (DH)/
Auto/Manual (DL)
R SA 03 00 1C 00 01 CRC Refer to Section 5.4.5/6
RS SA 03 02 DH DL CRC
29 (1D) Fault (DH)/
Commanded Direction (DL)
R SA 03 00 1D 00 01 CRC Refer to Section 5.4.7/8 [4d]
RS SA 03 02 DH DL CRC
30 (1E) Motor Voltage R SA 03 00 1E 00 01 CRC 0 250 1% 5.5
RS SA 03 02 DH DL CRC
40 (28) Keypad Speed Command
R SA 03 00 28 00 01 CRC
0 2400 0.1 Hz 5.6
RS SA 03 02 DH DL CRC
W SA 06 00 28 DH DL CRC
RS SA 06 00 28 DH DL CRC
48 (30) Unlock Commands W SA 06 00 30 DH DL CRC 0 9999 None 5.7
RS SA 06 00 30 DH DL CRC
49 (31) Unlock Parameters W SA 06 00 31 DH DL CRC 0 9999 None 5.8
RS SA 06 00 31 DH DL CRC
50 (32) Register Version R SA 03 00 32 00 01 CRC 0 65535 None 5.9
RS SA 03 02 DH DL CRC

11 RG-SFMOD
Drive Control & Communication
5.1 Abbreviations
Table 6 lists the abbreviations used in Table 5 SCF Drive Control Registers:
Table 6: Abbreviations
Abbreviation Description
R Read
W Write
RS Response
SA Slave Address (typically 01 through F7 hex)
CRC Cyclic Redundancy Check High + Low bytes
DH Data High byte
DL Data Low byte
B Byte
ACT# AC Tech Register # (Modbus Register numbers are 1 larger)
5.2 Drive Control - Register #1
Table 7 illustrates the Data High Byte and Data Low Byte format of Register #1, Drive Control.
Table 7: Drive Control - Register #1
Data Low Byte
0 UPDATE BUFFERS
1 LOCK SECURITY
2 STOP DRIVE
3 START DRIVE
4 UNUSED
5 UNUSED
6 SET REVERSE
7 SET FORWARD
Data High Byte
8 AUTO MODE
9 MANUAL MODE
10
11
12
13
14
15
The appropriate bit is set to 1. For example, to stop the drive bit two is set (send 0004H). To start the drive
send 0008H. Setting update buffers bit, enables to start the drive using downloaded data. Locking security
disables the serial drive control, the communications watchdog timer and prevents any further writing to
control or parameter registers.

RG-SFMOD 12
Drive Control & Communication
NOTE 1 - Drive Control
• During each write to Register #1 only one bit should be set in the drive control word.
• If more than 1 bit is set, the drive responds to stop bit only.
• If stop bit is not set, but more than 1 bit is set, drive responds with exception 04.
NOTE 2 - Drive Family
• The QC and DL Series drives return 64 (40H)
• The MC Series drives return 65 (41H)
• The SC Series drives return 66 (42H)
• The MCH Series drives return 68 (44H)
• The smd Series drives return 69 (45H)
• The TC Series drives return 70 (46H)
• The tmd Series drives return 71 (47H)
• The SMV Series drives return 72 (48H)
NOTE 3 - Drive Size
On SC series drives this register always read zero
5.3 Drive Hardware Configuration - Register #22
Table 8 lists the SCF Drive Hardware Configuration, Register #22. Bits 4 - 15 are not used at this time.
Table 8: Register 22 - Drive Hardware Configuration
BIT # STATE MEANING
0 1 Reserved
0 Reserved
1 1 Reserved
0 Reserved
2 1 OEM defaults present
0 No OEM defaults
3 1 User data on EPM is compatible only
0 Either the parameter version of the EPM matches the current software or the
EPM is not compatible. If incompatible then one of the following faults are
responsible: CF (control fault), cF (incompatibility fault) or GF (data fault)
Bit 3 = 1: the USER data on the EPM is compatible only. The data on the EPM is valid and usable by
the drive but the parameter version of the data does not match the parameter version that the drive is
currently using. Therefore the user will not be able to edit any of the data on the EPM until they perform a
TRANSLATE with P48.

13 RG-SFMOD
Drive Control & Communication
5.4 Drive Status - Registers #24-29
5.4.1 Reading Register #24
When reading register #24, the group of words requested can be either 1 or 6. This is an exception to the
rule of being able to read only one register at a time. If 6 words are requested at register #24, the following
will be returned:
Table 9: 6 Register read at #24
Parameter Data Byte
Command Speed D1H D1L
Actual Speed D2H D2L
Load D3H
Operation Status D3L
Rotational Direction D4H
Control Mode D4L
Speed Command Source D5L
Auto/Manual Status D5H
Present Fault D6H
Command Rotation D6L
NOTE 4a - Command Speed (Bytes D1H and D1L or Register #25)
• In tenths of a Hz
• Most significant byte is first, followed by Least significant
• Example: 02 01 in hex converts to 51.3Hz in decimal (assumed 1 decimal place).
NOTE 4b - Actual Speed (Bytes D2H and D2L or Register #25)
• In tenths of a Hz
• Most significant byte is first, followed by Least significant
NOTE 4c - Load (Bytes D3H or Register #26 DH)
• In percent of full load
• Example: 64 (one byte in hex) ==> 100 in decimal ==> 100% (drive load).

RG-SFMOD 14
Drive Control & Communication
5.4.2 Operational Status - Register #26
Table 10 lists the Operational Status (byte D3L or Register #26 DL)
Table 10: Operational Status
Setting Parameter
0 FAULT LOCKOUT
1 FAULT
2 START PENDING
3 STOP
4 DC BRAKE
5 RUN AT 0Hz
6 RUN
7 ACCEL
8 DECEL
9 CURRENT LIMIT
10 DECEL OVERRIDE
11 LOWER TRANSISTORS SWITCHING ON
5.4.3 Actual Rotational Direction - Registers #24 & 27
Table 11 lists the Actual Rotational Direction (Register #24 byte D4H or Register #27 DH).
Table 11: Actual Rotational Direction
Setting Direction
0 FORWARD
1 REVERSE
5.4.4 Control Mode - Registers #24 & 27
Table 12 lists the Control Mode (Register #24 byte D4L or Register #27 DL).
Table 12: Control Mode
Setting Control Operation
0 TERMINAL Start/Stop operation controlled from the drive's control board terminal strip
1 REMOTE KEYPAD Start/Stop operation controlled from remote keypad
2 or 3 SERIAL Start/Stop operation controlled via serial link

15 RG-SFMOD
Drive Control & Communication
5.4.5 Speed Command Source - Registers #24 & 28
Table 13 lists the Speed Command Source (Register #24 byte D5H or Register #28 DH).
Table 13: Speed Command Source
Setting Source
0 KEYPAD
1 0 – 10VDC
2 4 – 20MA
3 PRESET 1
4 PRESET 2
5 PRESET 3
6 PRESET 4
7 PRESET 5
8 PRESET 6
9 PRESET 7
10 JOG
11 MOP
5.4.6 Auto/Manual Status - Registers #24 & 28
Table 14 lists the Auto/Manual Status (Register #24 byte D5L or Register #28 DL).
Table 14: Auto/Manual Control
Setting Control
0 AUTO
1 MANUAL

RG-SFMOD 16
Drive Control & Communication
5.4.7 Present Fault - Registers #24 & 29
Table 15 lists the Present Fault (Register #24 byte D6H of Register #29 DH)
Table 15: Present Fault
Setting Fault Display
0 NO FAULT
1 OUTPUT (TRANSISTOR) FAULT “OF”
2 HIGH DRIVE TEMPERATURE “AF”
3 HIGH DC BUS VOLTAGE “HF”
4 LOW DC BUS VOLTAGE “LF”
5 THERMAL OVERLOAD “PF”
CONTROL FAULT “CF”
7 EXTERNAL “EF”
8 OEM FAULT “GF”
9 START ERROR “UF”
10 INTERNAL1 (EPM) “F1”
11 INTERNAL2 “F2”
12 INTERNAL3 “F3”
13 INTERNAL4 “F4”
14 INTERNAL5 “F5”
15 INTERNAL6 “F6”
16 INTERNAL7 “F7”
17 INTERNAL8 “F8”
18 INTERNAL9 “F9”
19 INTERNALo “Fo”
20 SINGLE PHASE FAULT “SF”
21 INCOMPATIBILITY FAULT “cF”
22 DYNAMIC BRAKE OVERHEATED “dF”
23 SERIAL LINK FAULT “JF”
5.4.8 Commanded Rotational Direction - Registers #24 & 29
Table 16 lists the Commanded Rotational Direction (Register #24 byte D6L or Register #29 DL)
Table 16: Commanded Rotational Direction
Setting Direction
0 FORWARD
1 REVERSE
NOTE 4d - Commanded Rotational Direction
Register NOT used on SCF drives prior to software version 48, revision 7 (4807) and
software version 57, revision 3 (5703).