Watlow EZ-ZONE RMH - Manual (Page 10)

Watlow EZ-ZONE ® RMH Module • 7 • Chapter 1 Overview
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.
RMH Module Connected to an Operator Interface
Terminal (OIT) through an RMA
In this configuration the RMH 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 RMH 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
RMH
Controller
RM
Access
Slot
E
RUI OIT
Power
Supply
Notice that in the example above that there is an
optional RUI connected to the RMH along with the
OIT. OITs' are not generally used to configure a con-
trol but are used more for run-time information. As
an alternative 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 RMH 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.
RMH 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
communicate with all modules (maximum 16 mod-
ules any combination with one Access module).
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.
RMH Connected to a Remote User Interface (RUI)
and a Personal Computer (PC)
In this configuration the RUI and PC are connected
to the RMH module via Watlow's Standard Bus
where both will be able to talk directly to the RMH
module.
RMH
Controller
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 RMH and other mod-
ules connected to it.
RMH Module Connected to a Programmable Logic
Controller (PLC) on a DIN Rail
In this configuration the PLC can be connected to
the RMH module using the Modbus RTU protocol:
RMH
Controller
Slot C
Power
Supply
PLC
PC Running
EZ-ZONE
Configurator
In this example, the RMH module and the PLC must
be equipped with the Modbus RTU protocol.
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 RMH to Watlow's Stan-