Watlow EZ-ZONE RMA Modul - Manual (Page 23)

Watlow EZ-ZONE ® RMA Module • 20 • Chapter 2 Install and Wire
Page under the Backup Menu.
For parameters listed as float notice that only
one (low order) of the two registers is listed, this is
true throughout this document. By default, the low
order word contains the two low bytes of the 32-bit
parameter. As an example, look in the RMA Setup
Page for the Real Time Clock Value. Find the column
identified in the header as Modbus and notice that it
lists register 1424. Because this parameter is a float
it is actually represented by registers 1424 (low or-
der bytes) and 1425 (high order bytes). The Modbus
specification does not dictate which register should
be high or low order so Watlow provides the user the
ability to swap this order (Setup Page, Communica-
tions Menu) from the default low/high to high/low.
It should also be noted that some of the cells in the
Modbus column contain wording pertaining to an
offset. Several parameters in the RMA contain more
than one instance; such as, Data Log points (250),
Variables (12), Gateway Instances (16), etc... The
Modbus register shown always represents instance
one. Take for an example the logging point param-
eter found in the RMA Setup Page under the Log
Point Menu. Instance one for the Source Function
is shown as address 1470 and the offset to the next
instance is identified as +16. If there was a desire to
read or write to instance 3 simply add 32 to 1470 to
find its address, in this case, the instance 3 address
for Log Point Source Function 3 is 1502.
RMA _ - A [2, 3] _ _ - A A _ _
To learn more about the Modbus protocol point your
browser to http://www.modbus.org .
Common Industrial Protocol (CIP)
DeviceNet & Ethernet/IP
Both DeviceNet and EtherNet/IP use open object
based programming tools and use the same address-
ing scheme. In the following menu pages notice the
column header identified as CIP. There you will find
the Class, Instance and Attribute in hexadecimal,
(decimal in parenthesis) which makes up the address-
ing for both protocols.
Note:
The RMA module equipped with EtherNet/IP supports
implicit and unconnected explicit messages.
Data Types Used with CIP
uint = Unsigned 16 bit integer
int = Signed 16-bit
dint = Signed 32-bits, long
real = Float, IEEE 754 32-bit
string = ASCII, 8 bits per character
sint = Signed 8 bits , byte
RMA _ - A [3] _ _ - A A _ _
To learn more about the DeviceNet and EtherNet/IP
protocol point your browser to http://www.odva.org .
Profibus DP
To accommodate for Profibus DP addressing the fol-
lowing menus contain a column identified as Profibus
Index. Data types used in conjunction with Profibus
DP can be found in the table below.
Data Types Used with Profibus DP
Word = Unsigned 16 bit
INT = Signed 16-bit Integer
dint = Signed 32-bit Integer
REAL = Float, IEEE 754 32-bit
CHAR = ASCII, 8 bits per character
BYTE = 8 bits
RMA _ - A [6] _ _ - A A _ _
To learn more about the Profibus DP protocol point
your browser to http://www.profibus.org