Watlow Electric Gateway & DeviceNet - Manual (Page 19)

RUI/Gateway & DeviceNet TM
Configuration & Ladder Logic Example
Using an Allen-Bradley CompactLogix PLC
Watlow
1241 Bundy Blvd
Winona, MN 55987
Telephone: 507-494-5656
© 2007 Watlow Electric Mfg Co 19
4/08
Device Physical Address Logical Address (Set by User)
Personal Computers 0-3 1-4
RUI 4-11 1-8
Communication Cards 12-15 1-4 (indirectly set by user)
EZ-ZONE
®
Controllers 16-31 1-16
The first graphic in step 35 shows the first member of the custom T to O assembly
“GTW_Inputs.Device_Status”. Interpreting the bits…bit 0 is shown on the far right where bit
31 is on the far left. The bits that are shown as being set to a “1” represent those devices that
the RUI/Gateway is enabled to speak to (Gateway instance). So, bit 16 through 19 represents
the PM controls on the Standard Bus side of the RUI/Gateway (1 - 4, as seen in step 17)
where bit 12 represents the physical address for the DeviceNet
TM card in the RUI/Gateway.
Each of these bits can be monitored in the PLC where an alarm can be driven if communi-
cations with any enabled PM control fails.
36. Note that in the table above (step 35) showing both logical and physical addresses (logical
addresses are set by the user) that the communications card addressing is not set directly by
the user. To relieve the burden of having to set multiple Standard Bus addresses in the
RUI/Gateway the communication card picks up its address through the RUI/Gateway firm-
ware. If the RUI/Gateway Standard Bus address (with a comms card installed) is set to logical
address 1 the communications card Standard Bus physical address will automatically be set
12. See table below for valid communications card addressing. As can be seen below, if the
communications card is to be given a valid address the RUI/Gateway logical address must be
set to a value ranging from 1-4.
RUI/Gateway Addressing Communications Card
Standard Bus
Physical Address
Logical Address
(Set by User)
Physical Address
4 1 12
5 2 13
6 3 14
7 4 15
8 5 Not Valid
9 6 Not Valid
10 7 Not Valid
11 8 Not Valid