User manual

PID Loop Operation
(DL450 Only)
Maintenance
8--23
PID Loop Operation (DL450 only)
DL405 User Manual, 4th Edition, Rev. A
The bit definitions for PID Mode Setting 2 word (Addr+01) are listed in the following
table. More information about the use of this word is available later in this chapter.
Bit PID Mode Setting 2 Description Read/Write Bit=0 Bit=1
0
Input (PV) and Control Output Range
Unipolar/Bipolar select
(See Notes 1 and 2)
write unipolar bipolar
1
Input/Output Data Format select
(See Notes 1 and 2)
write 12 bit 15 bit
2 reserved for future use -- -- --
3 SP Input limit enable write disable enable
4 Integral Gain (Reset) units select write seconds minutes
5 Select Autotune PID algorithm write closed loop open loop
6 Autotune selection write PID
PI only
(rate = 0)
7
Autotune start (Note: Bit 7 can be used to
cancel Autotune mode by setting it to 0.)
read/write
autotune
done
force start
8 PID Scan Clock (internal use) read -- --
9
Input/Output Data Format 16-bit select
(See Notes 1 and 2)
write
not
16 bit
select
16 bit
10
Select separate data format for input and
output (See Notes 2 and 3)
write
same
format
separate
formats
11
Control Output Range
Unipolar/Bipolar select
(See Notes 2 and 3)
write unipolar bipolar
12
Output Data Format select
(See Notes 2 and 3)
write 12 bit 15 bit
13
Output data format 16-bit select
(See Notes 2 and 3)
write
not
16 bit
select
16 bit
14--15 Reserved for future use -- -- --
NOTE 1: If the value in bit 9 is 0, then the values in bits 0 and 1 are read. If the value in
bit 9 is 1, then the v alues in bits 0 and 1 are not read, and bit 9 defines the data format
(the range is automatically unipolar).
NOTE 2: If the value in bit 10 is 0, then the values in bits 0, 1, and 9 define the input
and output ranges and data formats (the values in bits 11, 12, and 13 are not read). If
the value in bit 10 is 1, then the values in bits 0, 1, and 9 define only the input range
and data format, and bits 11, 12, and 13 are read and define the output range and
data format..
NOTE 3: If bit 10 has a value of 1 and bit 13 has a value of 0, then bits 11 and 12 are
read and define the output range and data format. If bit 10 and bit 13 each have a
value of 1, then bits 11 and 12 are not read, and bit 13 defines the data format, (the
output range is automatically unipolar).
PID Mode Setting 2
Descriptions
(Addr + 01)