5
05/10 AWB1230-1622
Effective May 2010
mMINT—Modbus Translator Module—
installation and use
EATON CORPORATION
www.moeller.net/en/support
Modbus RS-485 network Rx LED (green)
The LED will be lighted whenever the module is receiving from the
Modbus RTU network .
Modbus RS-485 network Tx LED (green)
The LED will be lighted whenever the module is transmitting on the
Modbus RTU network .
INCOM network Rx LED (green)
The LED will be lighted whenever the module is receiving from the
INCOM network .
INCOM network Tx LED (green)
The LED will be lighted whenever the module is transmitting on the
INCOM network .
Status LED (green)
This indicator will be flashing whenever a voltage is supplied to
the module and the microcontroller is executing instructions . The
flashing rate is approximately 1 second ON/1 second OFF . Detection
of a communications error on either the Modbus or INCOM
network will result in an increased flashing rate approximately
0 .5 second ON/0 .5 second OFF . The rate will return to normal when
the network’s diagnostic reset subfunction (clear UART or slave
counters, respectively) is processed by the mMINT . See Section 6
and
Table 6
.
INCOM 100 load resistance (DIP switch SW1)
This switch should be moved to the ON position when it is the last
device in a chain of devices or if it is a single device .
Modbus RS-485 baud rate (DIP switch SW2)
To configure the data transfer rate for the Modbus RTU network,
three switches in DIP switch SW2 should be set . Refer to
Table 4
.
SW2-1 is for mMINT diagnostics .
Table 4. RS-485 Baud Rate Switches (Normal)
Baud
SW2-1
SW2-2
SW2-3
1200
X
On
On
9600
X
Off
On
19200
X
On
Off
mMINT diagnostics address (SW2)
The mMINT can be assigned address 247 and 248 . For the mMINT
to respond to a diagnostic query related to address 247 or 248 on
the Modbus network, move DIP switch SW2-1 to the OFF position .
Refer to
Table 5
. Normally, this switch is in the ON position .
Table 5. RS-485 Baud Rate Switches (Diagnostics)
Baud
SW2-1
SW2-2
SW2-3
Addr. 247 or 248
Off
X
X
Normal
On
X
X
Modbus 121 load resistance (DIP switch SW3)
This switch should be moved to the ON position only when it is the
last device in a chain of devices or if it is a single device .
Section 6: Network communication
protocols
The INCOM communication network for the mMINT is based
on a master-slave protocol . The mMINT is the master on the
INCOM network .
For further information, please see Reference Material:
IL17384—Part A: IMPACC Communications Standard, Eaton .
Specific product profiles are located in the other Part sections .
http://www .eaton .com, then search for 17384 .
Modicon Modbus Protocol,
http://www .modicon .com/techpubs/toc7 .html
Overview
The contents of Modbus registers are INCOM product objects
(e .g ., I
A
– phase A) . An overview of the Modbus register is shown
in
Table 8
or
Table 9
.
INCOM objects occupy two registers except for certain energy
objects . These energy objects occupy four registers . The mMINT
can support 122 registers maximum .
In its default configured state, INCOM addresses are
Modbus addresses .
Only the RTU communications mode is supported by the mMINT .
Function codes
The mMINT supports function codes 03, 04, 08, and 16 (10
16
) .
03 Read register
04 Read entry register
08 Connection test
16 Write register
Configuring the data registers
In order to be able to request the desired combination of registers
in a telegram, you can load a register table starting with register
41001142481(03E8
16
/5000
16
) in which the Modbus register
addresses are loaded in series in hex .
For example, although object I
A
occupies registers 404611 (1202
16
)
and 404612 (1203
16
), only register address (1202
16
) is loaded in
the register table . mMINT can verify that the load was successful
by the read function code 03 or 04 from the 41001/420481
(03E8
16
/5000
16
) register .
The data can only be requested in a read access starting at register
41201/420737 (04B0
16
/5100
16
) .
The total number of data block of registers is limited to 100 .
otee:
N
An object can occupy one, two, or four registers .
The data may be read from the register using the read function
code 03 or 04 . The address of the starting object is 5100
16
.
The number of registers to be read must match the number of
configured registers .
