Watlow EZ-ZONE RM Limit Module Rev C - Manual (Page 9)

Watlow EZ-ZONE ® RML Module • 6 • Chapter 1 Overview
Note:
If it is intended to use an RUI or a PC using EZ-
ZONE Configurator software it will be necessary to
switch the protocol on the RML to Watlow's Stan-
dard Bus to successfully communicate; disconnect
all Modbus devices from the network. Once done
using the RUI or EZ-ZONE Configurator software,
switch the protocol back to Modbus RTU and recon-
nect all Modbus devices to re-establish communica-
tions over Modbus.
RML Module Connected to an Operator Interface
Terminal (OIT) through an RMA
In this configuration the RML can be connected to
the OIT through the RMA running any of a number
of available protocols. The RMA and the OIT must
be using the same protocol while the communications
from RMA to the RML module is accomplished over
the backplane using Watlow's Standard Bus protocol.
Available protocols in the RMA follow:
1. EtherNet/IP and or Modbus TCP
2. DeviceNet
3. Modbus RTU
4. Profibus DP
Slot C Slot C
RM
Limit
RM
Access
Slot
E
RUI OIT
Power
Supply
Notice that in the example above that there is an op-
tional RUI connected to the RML along with the OIT.
OITs' are not generally used to configure a control
but are used more for run-time information. As an al-
ternative for configuration the RUI could be used to
configure and monitor in a remote location.
One advantage in using an RMA module when com-
municating on a network is that protocol switching
is not needed on the RML module if using an RUI
or EZ-ZONE Configurator software. The protocol of
choice used with the RMA can run simultaneously
with the Standard Bus protocol.
RML Connected to a Split Rail with OIT
In this configuration both the inter-module bus
(backplane communications) and Standard Bus are
connected between rails to allow for remote capabili-
ties. It is recommended that the split rail connection
not exceed 100 feet. In this configuration the OIT can
put has malfunctioned), the output assigned to serve
as this function will come on. By default (factory set-
tings), output 8 is assigned this function where any
output of choice can be configured as such.
A Conceptual View of RM Hardware Configurations
Due to the scalability and flexibility in the RM sys-
tem a user has several options available in the way
that the hardware can be connected. Listed below
are a few examples.
RML Connected to a Remote User Interface (RUI)
and a Personal Computer (PC)
In this configuration the RUI and PC are connected
to the RML module via Watlow's Standard Bus where
both will be able to talk directly to the RML module.
RM
Limit
Slot C
Power
Supply
RUI
PC Running
EZ-ZONE
Configurator
In the graphic above the PC running EZ-ZONE Con-
figurator software and or the RUI can be used to
configure and then monitor the RML and other mod-
ules connected to it.
RML Module Connected to a Programmable Logic
Controller (PLC) on a DIN Rail
In this configuration the PLC can be connected to
the RML module using the Modbus RTU protocol:
Slot C
RM
Limit
PLC
Power
Supply
In this example, the RML module and the PLC must
be equipped with the Modbus RTU protocol.