1785-UM022B-EN-P - February 2002
4-2 Programming Your ControlNet System
The fields of the MG data type that you can directly address are:
For more detailed information about writing ladder programs and
using message instructions, see your programming software
documentation.
Multihop Messaging Via the MSG Instruction
You can use the MSG instruction to communicate from a processor
on one ControlNet link to a processor on another ControlNet link via
ControlBus using 1756-CNB ControlNet bridge modules.
You can also configure a ControlNet ladder MSG instruction to:
• a Data Highway Plus device by bridging across the 1756-CNB(R)
and 1756-DHRIO modules
• an Ethernet device by bridging across the 1756-CNB(R) and
1756-ENET modules
Refer to your programming software documentation for information
about configuring multihop messages.
enter the size in
elements
Type a number of elements from 1 to 1000.
enter the destination
network address
Type a number from 1 to 99.
enter a destination
data table address
Type the destination data table address.
If you want to: Do this:
Field Definition Location
.EW
Enabled-waiting flag bit word 0, bit 02
.CO
Continuous control bit word 0, bit 03
.ER
Errored flag bit word 0, bit 04
.DN
Done flag bit word 0, bit 05
.ST
Started flag bit word 0, bit 06
.EN
Enabled flag bit word 0, bit 07
.TO
Abort (Time out) control bit word 0, bit 08
.NR
No-response flag bit—not used word 0, bit 09
.NC
No-cache bit word 0, bit 10
.ERR
Error-code word word 1
.RLEN
Requested length word word 2
.DLEN
Done length word word 3
.DATA[0] through.DATA[51]
Remaining words words 4 through 55
1756-CNB
ControlBus
ControlNet Link 1 ControlNet Link 2
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