Watlow EZ-ZONE RMA Modul User Manual
Page 54
Watlow EZ-ZONE
®
RMA Module
•
51
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Chapter 7 RMA Communications
the front panel for six seconds to go the the Setup
Menu.
2. Push the up or down arrow key until [gtw]
(Gateway Menu) appears in the upper display
and [`SEt] in the lower display.
3. Push the green Advance Key
‰
to begin configu-
ration of the first gateway instance (RM module
zone 1). The upper display shows instance one [1]
and the lower display shows the gateway prompt
[gtw]
.
4. Push the green Advance Key
‰
once where the
upper display indicates [``no] as the default
and the lower display shows the enable/disable
prompt [du;en].
6. Push the Advance Key
‰
to view the current sta-
tus of this instance. The upper display will show
either [`off] or [``on] depending on whether or not
a successful link has been established between
gateway and slave device. This is a read only
prompt.
7. Push the Advance Key
‰
to view the current
Modbus offset where the upper display will show
zero [```0] as a default and the lower display
show the Modbus Offset prompt [m ;of]. If de-
sired, use the up arrow key to change the offset.
8. Push the Infinity Key ˆ three times or push it
and hold for approximately 3 seconds to navigate
back to the Home Page.
Communications To/From a Master:
After configuring the gateway in order to read or
write the expected parameter from the expected
module the Modbus Offset prompt [mof] is most
significant. This parameter provides an offset for the
purpose of module selection while at the same time
providing the ability to read and or write to any giv-
en Modbus register.
As an example, lets assume the offsets are as
shown in the graphic on the previous page (RMA
with Modbus RTU Gateway) and the Master wants
to read instance one Closed Loop Set Point from both
RM module address 1 and 4. Open up the associated
RM User's Guide, turn to the Operations Page and
look in the Loop Menu for Closed Loop Set Point. To
read instance one Closed Loop Set Point from RM
module address 1 the appropriate absolute Modbus
address would be:
2500 + 400001 + Modbus offset (0) = 402501.
Notice that there is no offset applied in this example.
To read the Closed Loop Set Point from RM module
address 4 the absolute address would now be:
2500 + 400001 + Modbus offset (30000) = 432501.
As can be seen in this example, the Modbus Offset
defines the module (RM 4) where the specific Mod-
bus address for the parameter in question does not
change. The values given for the Modbus Offset
[mof]
prompt also determine the available Modbus
addresses for each module. Looking at the graphic on
the previous page, the following Modbus addresses
would be available for each module:
RM 1, 400,001 - 410,000
RM 2, 410,001 - 420,000
RM 3, 420,001 - 430,000
RM 4, 430,001 - 440,000
Note:
The Modbus Offset
[M;oF]
as modified through the
RUI cannot exceed 9999. Therefore, if it is desired
to utilize a Modbus offset as shown in the previous
graphic (above 9999) it must be entered using EZ-
ZONE Configurator software. This software can be
downloaded free of charge from the Watlow web site:
Default RMA Communication Parameters (Modbus
RTU)
If your model number has a two in the identified
placeholder (RMA x - x [2] x x - x x x x) then these
defaults apply.
Address ([Ad;M]) = [```1]
Baud Rate ( [bAUd]) = [9600]
Parity ([PAr]) = [none]
Word Order [m;hl]) = [lohi]
Modbus Units ([`C_f]) = [```f]
Non-volatile Save ([`nU;s]) = [`yes]
Using an RUI, change or view the RMA communica-
tion defaults by following the steps below:
1. Push and hold the up and down arrow keys on
the front panel for six seconds to go the the Set-
up Menu.
2. Push the up or down arrow key until [CoM]
(Communications Menu) appears in upper dis-
play and [`SEt] in the lower display.
3. Push the green Advance Key
‰
to enter the
Communications Menu. The upper display
shows [```1], and the lower display shows
[ad;m]
.
4. Push the up arrow key to change the Modbus
address.
5. Push the green Advance Key
‰
to change the
baud rate. The upper display shows [9600], and
the lower display shows [bAUd]. Use the up or
down arrow key to change the baud rate.
6. Push the Advance Key
‰
to change parity. The
upper display shows [nonE] and lower display
shows [`PAr]. Use the up or down arrow key to
change the parity.
7. Push the Advance Key
‰
to change the Modbus
TCP Word Order, which allows the user to swap
the high and low order 16 bit values of a 32 bit
member. The upper display shows [lohi] and
lower display shows [m;hl]. Use the up or down
arrow key to change the word order.
8. Push the Advance Key
‰
to change the tem-