Page 8-1
MPS Motor Protection System Rev. 6-F-022117
Personal Computer Interface
8. COMMUNICATIONS
8.1 PERSONAL-COMPUTER INTERFACE
8.1.1 FIRMWARE UPGRADE
The MPS-CTU control program is stored in flash
memory. Field updates can be made through the I/O
module communications connection. The following are
required:
• A Windows
Ò
PC with the SE-Flash program installed
• A file containing the MPS-CTU control program (.s19
file)
• An RS-232/RS-485 converter that operates at 57,600
bit/s. Use the Littelfuse Startco SE-485-PP or
SE-485-DIN.
SE-Flash is available at www.littelfuse.com/
relayscontrols.
8.1.2 SE-COMM-RIS
SE-Comm-RIS is a Windows-based program used to
access MPS functions with a personal computer (PC) via
the RS-485 network interface or Modbus
®
TCP
(1)
. Use SE-
Comm-MPS to program an MPS either by changing
individual set points or by downloading set-point files.
Existing MPS set points can be transferred to the PC.
Metered values can be viewed simultaneously and the MPS
can be controlled with the computer.
SE-Comm-RIS extends the event-record storage capability
of the MPS by allowing the user to transfer data to PC
memory at a programmable interval. Protection curve
plotting capability is included. SE-Comm-RIS is available
at www.littelfuse.com/relayscontrols.
(1)
Requires Ethernet option and firmware 2.50 or higher.
8.2 NETWORK INTERFACE
Each MPS-CTU is equipped with an RS-485 interface
and can be optionally equipped with a DeviceNet, Ethernet,
or Profibus interface. Communications interfaces are
mutually exclusive; only one can be used at a time.
For detailed information see Appendices in this manual
and applicable communications manuals.
8.2.1 RS-485 COMMUNICATIONS
SE-485 communications support Modbus
®
RTU and
Allen Bradley
®
DF1 half-duplex protocols. All set points
and meter values are accessible. Commands are provided
to perform trips, resets, and starter control.
Modbus
®
RTU function codes supported:
• Read Holding Registers (Code 3)
• Read Input Registers (Code 4)
• Write Single Register (Code 6)
• Write Multiple Registers (Code 16)
• Command Instruction (Code 5)
DF1 Commands Supported
• Unprotected Read (CMD = 01)
• Unprotected Write (CMD = 08)
• Typed Read (CMD = 0F, FNC = 68)
• Typed Write (CMD = 0F, FNC = 67)
• Typed Logical Read (CMD = 0F, FNC = A2)
• Typed Logical Write (CMD = 0F, FNC = AA)
8.2.2 DEVICENET COMMUNICATIONS
DeviceNet™ communications support Explicit
Messaging and Polled I/O. All set points and meter values
are accessible using Explicit Messaging. The Polled I/O
connection supports the following ODVA input
assemblies:
• Basic Overload (50)
• Extended Overload (51)
• Basic Motor Starter (52)
• Extended Motor Starter 1 (53)
• Extended Motor Starter 2 (53)
In addition to the ODVA assemblies, a user-configurable
fixed block of 64 bytes is available.
The Polled I/O connection supports the following
ODVA Output assemblies:
• Basic Overload (2)
• Basic Motor Starter (3)
• Extended Contactor
• Extended Motor Starter
An Electronic Data Sheet (EDS) file is provided for use
with DeviceNet configuration tools such as RSNetWorx
and DeltaV.
8.2.3 ETHERNET COMMUNICATIONS
The MPS supports Modbus
®
TCP and Ethernet/IP using
the Anybus-S module from HMS Fieldbus Systems AB.
Data from the MPS consists of a 64-byte assembly
representing user-defined register data. A command
structure is provided to write set-point and MPS
commands.
Starting with firmware 2.50, Modbus
®
TCP provides
access to all MPS registers and supports SE-Comm-RIS.
8.2.4 PROFIBUS COMMUNICATIONS
The MPS supports Profibus-DP using the Anybus-S
module. Data from the MPS consists of a 64-byte assembly
representing user-defined register data.
A command structure is provided to write set-point and
MPS commands.
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