Learn about the popular Modbus industrial communication standard and how it can be used to control step motors

1. Development, Application Support &
Marketing Concepts
October 9, 2013
Jeff Kordik

2. Why Modbus?
 Modbus is a standard data transfer protocol that is
supported by many PLCs and HMIs
 By supporting Modbus on our products, applications using
PLCs or HMIs can easily
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command motion
query status
set drive parameters
launch Q segments
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3. How does it work?
 PLC is the master, drive is the slave
 Internal PLC or HMI memory is first loaded with
parameters to be sent to Modbus registers in the drive
 The drive (slave) address is specified
 The data range to transfer (how many bytes and what
location) is then set and the data is transferred
• Is it a good idea to have related functions mapped to adjacent
register addresses
• For example: speed, accel, decel and distance
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4. Two Kinds of Modbus
 Modbus/RTU Family:
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STM17/23/24
SWM24
ST5/10
STAC6
RS-232/485
 Target Launch Date: December, 2013
 Modbus/TCP in early 2014
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STM23/24
SWM24
ST
STAC5
Ethernet
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5. About Modbus
 Modbus standards are established by The Modbus
Organization
 Applied Motion Products is a proud member of The
Modbus Organization
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6. Modbus Stepper Products
These Modbus-enabled products were
introduced to the market on December 20,
2013
 STM24QF integrated step drive+motor
Encoder
feedback for
closed loop
control
• Available with RS-232 or RS-485 communication
• Stored Q programming capability for distributed
intelligence
 SWM24QF integrated step drive+motor
• IP65 rated for harsh environments
• Available with RS-232 communication
• Stored Q programming capability for distributed
intelligence
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7. Modbus Data Transfer Example
 Step 1: Setting up a Point to Point Move
PLC memory
Modbus registers SCL register mapping
V1300
Accel rate
V1301
Decel rate
V1302
V1303/4
RS-232
RS-485
Or
Ethernet
Accel rate
40001
AC
Decel rate
40002
DE
Speed
Speed
40003
VE
Distance
Distance
40004/5
DI
PLC
DSP
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8. Modbus Data Transfer Example
 Step 2: Starting a Point to Point Move
RS-232
RS-485
Or
Ethernet
PLC memory
V1305
Command
PLC
Modbus registers SCL register mapping
Command
40006
FL
DSP
Command register will contain a bit for each type of move:
FL, FP, SH, FS, FE, CJ etc
And other commands such as:
ST, SJ
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9. PLC Program (Ladder Logic)
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10. PLC Program (Ladder Logic)
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11. Modbus
 Application Support Objective: make sure our products
are easy to apply with the most popular and cost effective
PLCs and HMIs
 Marketing Objective: engage our channel partners to
pair our controls with their PLCs and HMIs
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Reproduction by any method or unauthorized circulation is prohibited without prior approval.
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12. Popular Modbus PLCs in North America

13. Schneider/Modicon
 Modicon, invented Modbus
 Owned by Schneider
 One of world’s best selling
PLC lines
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14. Automation Direct/Direct Logic
 Popular online automation
retailer
 Have own PLC line, lowest
cost
 Application note for
controlling Applied Motion
Products Modbus drives
by Jeff Kordik is available
at http://www.appliedmotion.com/support/applic
ation-notes
Applied Motion Products Confidential and Proprietary
Reproduction by any method or unauthorized circulation is prohibited without prior approval.
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15. Omron
 Making big push into U.S.
market
 July 2013: introduced
“Easy Modbus Master”
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16. Popular Modbus HMIs in North America

17. Proface
 Sold by many Applied
Motion channel partners
 Powerful color
touchscreen HMI with RS232 and Ethernet
 Application note for
controlling Applied Motion
Products Modbus drives
by Jeff Kordik is available
at http://www.appliedmotion.com/support/applic
ation-notes
Applied Motion Products Confidential and Proprietary
Reproduction by any method or unauthorized circulation is prohibited without prior approval.
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18. Beijer
 Sold by many Applied
Motion channel partners
 Powerful color
touchscreen HMI with RS232 and Ethernet
 Application note for
controlling Applied Motion
Products Modbus drives
by Jennifer Gaona is
available at
http://www.appliedmotion.com/support/applic
ation-notes
Applied Motion Products Confidential and Proprietary
Reproduction by any method or unauthorized circulation is prohibited without prior approval.
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19. Automation Direct
 Popular online automation
retailer
 EA1-T6CL 6” color
touchscreen HMI is a good
value.
 Application note for
controlling Applied Motion
Products Modbus drives
by Jeff Kordik is available
at http://www.appliedmotion.com/support/applic
ation-notes
Applied Motion Products Confidential and Proprietary
Reproduction by any method or unauthorized circulation is prohibited without prior approval.
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