Allen-Bradley 1746-NT8 - Page 61

Publication 1746-UM022B-EN-P - January 2005
Programming Examples 5-5
B3:6
4
CHECKING_CJC
EN
DN
TON
Timer On Delay
Timer T11:1
Time Base 1.0
Preset 7<
Accum 0<
TON
CJC_CFG_TMR
T11:1
DN
CJC_CFG_TMR/DN
OSR
B3:0
4
MOV
Move
Source I:1.0
3744<
Dest N10:12
329<
MOV
CJC_TEMP
T11:1
DN
CJC_CFG_TMR/DN
MOV
Move
Source N10:0
-32767<
Dest O:1.0
-32767<
MOV
NT8_CONFIGURATION
EN
DN
TON
Timer On Delay
Timer T11:2
Time Base 1.0
Preset 7<
Accum 0<
TON
REG_CFG_TMR
T11:2
DN
REG_CFG_TMR/DN
U
B3:6
4
CHECKING_CJC
END
0005
0009
0008
0007
0006
Wait 7 seconds for Channel 0 to accept CJC configuration and provide a data value (time
depends on module configuration).
Copy CJC Temperature (I:1.0) into CJC register (N10:12)
Move Channel 0’s regular configuration word into the Channel 0 configuration word and start timer to
ensure word has been accepted prior to taking the thermocouple temperature readings.
When CJC check cycle is completed (T1 1:2/DN is set), reset the Checking CJC Bit (B3/100).