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PID Loop Operation
Maintenance
8–9
PID Loop Operation
The individual bit definitions of the PID Mode Setting 1 word (Addr+00) are listed in
the following table. Additional information about the use of this word is available later
in this chapter.
Bit PID Mode Setting 1 Description Read/Write Bit=0 Bit=1
0 Manual Mode Loop Operation request write –
0
Õ
1
request
1 Automatic Mode Loop Operation re-
quest write –
0
Õ
1
request
2 Cascade Mode Loop Operation request write –
0
Õ
1
request
3 Bumpless Transfer select write Mode I Mode II
4 Direct or Reverse-Acting Loop select write Direct Reverse
5 Position / Velocity Algorithm select write Position Velocity
6 PV Linear / Square Root Extract select write Linear Sq. root
7 Error Term Linear / Squared select write Linear Squared
8 Error Deadband enable write Disable Enable
9 Derivative Gain Limit select write Off On
10 Bias (Integrator) Freeze select write Off On
11 Ramp/Soak Operation select write Off On
12 PV Alarm Monitor select write Off On
13 PV Deviation alarm select write Off On
14 PV rate-of-change alarm select write Off On
15 Loop mode is independent from CPU
mode when set write Loop with
CPU mode
Loop
Independent
of CPU mode
PID Mode Setting 1
Bit Descriptions
(Addr + 00)