User manual

PID Loop Operation
(DL450 Only)
Maintenance
and Troubleshooting
8--24
PID Loop Operation (DL450 only)
DL405 User Manual, 4th Edition, Rev. A
The individual bit definitions of the Mode/Alarm monitoring word (Addr+06) are listed
in the following table.
Bit Mode / Alarm Bit Description Read/Write Bit=0 Bit=1
0 Manual Mode Indication read -- Manual
1 Automatic Mode Indication read -- Auto
2 Cascade Mode Indication read -- Cascade
3 PV Input LOW--LOW Alarm read Off On
4 PV Input LOW Alarm read Off On
5 PV Input HIGH Alarm read Off On
6 PV Input HIGH--HIGH Alarm read Off On
7 PV Input YELLOW Deviation Alarm read Off On
8 PV Input RED Deviation Alarm read Off On
9 PV Input Rate-of-Change Alarm read Off On
10 Alarm Value Programming Error read -- Error
11 Loop Calculation Overflow/Underflow read -- Error
12--15 Reserved for Future Use -- -- --
The individual bit definitions of the Ramp/Soak Table Flag word (Addr+33) are listed
in the following table.
Bit Ramp/Soak Flag Bit Description Read/Write Bit=0 Bit=1
0 Start Ramp/Soak Profile write --
0¤1Start
1 Hold Ramp/Soak Profile write --
0¤1Hold
2 Resume Ramp/soak Profile write --
0¤1
Resume
3 Jog Ramp/Soak Profile write --
0¤1Jog
4 Ramp/Soak Profile Complete read -- Complete
5 PV Input Ramp/Soak Deviation read Off On
6 Ramp/Soak Profile in Hold read Off On
7 Reserved read Off On
8--15 Current Step in R/S Profile read decode as byte (hex)
Bits 8--15 must be read as a byte to indicate the current segment number of the
Ramp/Soak generator in the profile. This byte will have the values 1, 2, 3, 4, 5, 6, 7, 8,
9, A, B, C, D, E, F, and 10. which represent segments 1 to 16 respectively. If the
byte=0. then the Ramp/Soak table is not active.
Mode/Alarm
Monitoring Word
(Addr + 06)
Ramp/Soak Table
Flags
(Addr + 33)