Watlow Addendum to EZwarePlus - Manual (Page 9)

ZONE controllers via Ethernet, add three Modbus TCP/IP Master devices to the device list in the
System Parameter Settings dialog each configured to communicate with one controller.
Addressing Parameters in Multiple Controllers
Normally the Silver Series EM OIT assumes that any register address you enter when communicating
via Modbus RTU is associated with the controller at the network address you set in the PLC default
station no field in the Device Properties under the System Parameter Settings.
To read or write data from a register in another controller on a 485 network, enter the network address
and register address separated by the number sign or hash mark (#). For example “3#2501” accesses
register 2501 in the controller with the Modbus network address 3.
(074)
Address Offsets in Multi-Loop Controllers
In controllers with more than one loop of control, more than one limit etc., there is more than one
instance of each parameter for these duplicated functions. The manuals for controllers such as the EZ-
ZONE RM, list the Modbus address and an offset for these parameters. Add the offset to the address
once to get the address of the second instance of the parameter, add it twice to get the third instance and
so on.
For example, the address of the Heat Power for Loop 1 is listed in the EZ-ZONE RM manual as 2244
with an offset of 70. The following table lists the addresses of the Heat Power parameter for each of the
four possible loops in the controller. The table also reminds you to add one (1) to the relative addresses
from the controller manuals before entering the parameter address in EZwarePlus.
Loop Address + Offset(s)
Convert Relative
Address
Enter in
EZwarePlus
1 2224 2224 + 1 2225
2 2224 + 70 2294 + 1 2295
3 2224 + 70 + 70 2364 + 1 2365
4 2224 + 70 + 70 + 70 2434 + 1 2435
Accessing Parameters via EZ-ZONE RUI Gateways and RM
Access Modules
Multiple EZ-ZONE devices can communicate with the Silver Series EM OIT via one or more EZ-ZONE
RUI Gateways or EZ-ZONE RM Access modules. When ordered with either the Modbus TCP or
Modbus RTU communications option, an RUI Gateway or RM Access module allows a Silver Series
EM OIT to communicate with multiple EZ-ZONE controllers without purchasing communication
options in each controller.
Silver Series EM OIT  9  Watlow Addendum