PID Loop Operation
Maintenance
8–11
PID Loop Operation
The individual bit definitions of the Mode / Alarm monitoring (Addr+06) word is listed
in the following table. More details are in the PID Mode section and Alarms section.
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 Loop in Auto-Tune indication read Off On
13 Auto-Tune error indication read – Error
14–15 Reserved for Future Use – – –
The individual bit definitions of the Ramp / Soak Table Flag (Addr+33) word is listed
in the following table. Further details are given in the Ramp / Soak Operation section.
Bit Ramp / Soak Flag Bit Description Read/Write Bit=0 Bit=1
0 Start Ramp / Soak Profile write –
0Õ1 Start
1 Hold Ramp / Soak Profile write –
0Õ1 Hold
2 Resume Ramp / soak Profile write –
0Õ1
Resume
3 Jog Ramp / Soak Profile write –
0Õ1 Jog
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 – –
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)
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