Watlow Silver Series Addendum - Manual (Page 9)

Silver Series OIT  9  Watlow Addendum
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 EasyBuilder5000.
Loop Address + Offset(s)
Convert Relative
Address
Enter in
EasyBuilder5000
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 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
OIT to communicate with multiple EZ-ZONE controllers without purchasing communication options in
each controller.
In such a system the Silver Series OIT is connected to and configured to communicate with the gateway.
The gateway presents itself as a single device on the Modbus network; the OIT does not communicate
with the controllers, only with the gateway. The gateway is configured by the user with an address offset
for each controller connected to it. That address offset is added to the parameter addresses for the
controller.
For example, consider three EZ-ZONE PM controllers connected to an RUI Gateway configured with an
offset of 0 for the first controller, 5000 for the second controller and 10,000 for the third controller. The
table below indicates the addresses that must be entered in EasyBuilder5000 to access the set point value
in the three PM controllers.
PM Set Point Plus Gateway Offset
Convert Relative
Address
Enter in
EasyBuilder5000
1 2172 2172 + 0 2172 + 1 2173
2 2172 2172 + 5000 7172 + 1 7173
3 2172 2172 + 10000 12172 + 1 12173