Allen-Bradley 1746-NT8 - Page 70

Publication 1746-UM022B-EN-P - January 2005
5-14 Programming Examples
S:1
15
step
U
B3:0
4
NT8_CONFIGURED
B3:0
4
NT8_CONFIGURED
MVM
Masked Move
Source N30:2
256<
Mask 0FH
15<
Dest N11:3
0<
MVM
RIO_RACK1_FLT
NEQ
Not Equal
Source A N11:3
0<
Source B 0
0<
NEQ
RIO_RACK1_FLT
U
B3:0
4
NT8_CONFIGURED
B3:0
4
NT8_CONFIGURED
BT20:1
EN
NT8_BTW/EN
EN
DN
ER
BTW
Block Transfer Write
Module Type
Generic Block Transfer
Rack 001
Group 0
Module 0
Control Block BT20:1
Data File N12:10
Length 8
Continuous No
BTW
NT8_BTW
BT20:1
DN
BTW_DONE
L
B3:0
4
NT8_CONFIGURED
B3:0
4
NT8_CONFIGURED
BT20:0
EN
BTR_TRIGGER
EN
DN
ER
BTR
Block Transfer Read
Module Type
Generic Block Transfer
Rack 001
Group 0
Module 0
Control Block BT20:0
Data File N12:0
Length 8
Continuous No
BTR
END
During the first scan, clear the NT8 Configurated bit (B3/4) to initiate the NT8 configuration process.
First scan or SFC
If the NT8 is configured and a rack fault occurs, clear the NT8 Configured bit (B3/4) to initiate the NT8 configuration process.
Until the NT8 is configured, send the 8 configuration words (N12:10 - 17) to the NT8 using repeating BTW’s.
If the NT8 is configured, read the 8 input words into N12:0 - N12:7 using repeating BTR’s.
When the NT8 is configured latch the NT8 Configured bit (B3/4).