Rockwell Automation 2706-P42_P43_P44_P72_P74_P92_P94 InView Marquee Message Display User Manual - Manual (Page 102)

Publication 2706-UM016D-EN-P - March 2006
4-36 InView Protocol
Update a Variable using a Modbus ASCII 06 Frame in Guaranteed
Mode
This method writes (or loads) variable data to the appropriate variable
register in a specific display. The following is an example of loading
variable 32 (register 40032) with the value 612 in display address 005.
Transmission:
Query for Updating a Variable Register
Response:
The normal response to a function 06 is to echo (or re-transmit) the
query after the holding register is updated.
Response for Updating a Variable Register
Update Variables using a Modbus ASCII 10 frame in Broadcast
mode (Recommended)
This method allows the ability to update more than one variable
register in all displays. A maximum of 60 registers can be updated in
one transmission.
The following example shows how to update variables 1, 2, and 3
(registers 40001, 40002, and 40003) with values 24, 53, and 56
respectively in all displays.
Beginning
of Frame ADDR FUNC H.O.
ADDR
L.O.
ADDR
DATA LRC
Error
EOF Ready to
rec. resp
: 05 06 00 1F 0264 70 CR LF
Beginning
of Frame ADDR FUNC H.O.
ADDR
L.O.
ADDR
DATA LRC
Error
EOF Ready to
rec. resp
: 05 06 00 1F 0264 70 CR LF
TIP
Use of the Guaranteed mode for variable updates
may slow down variable updates due to the
response transmission.