Allen-Bradley SLC 500 Series User Manual

Publication 1747-RM001G-EN-P - November 2008
Proportional Integral Derivative Instruction 9-31
In this program, cycle time is the preset of timer T4:0. Cycle time relates to
% on-time as follows:
Example - Time proportioning outputs
T4:0.PRE is the cycle time
% on-time
100% output on-time
(L)
O:1.0
0
(U)
O:1.0
0
(RES)
T4:0
(EN)
(DN)
TIMER ON DELAY
Timer T4:0
Time Base 0.01
Preset 1000
Accum 0
NOT EQUAL
Source A N7:25
0
Source B 0
GREATER THAN
Source A T4:0.ACC
0
Source B N7:25
0
MULTIPLY
Source A N7:1
0
Source B T4:0.PRE
1000
Dest N7:25
0
DOUBLE DIVIDE
Source 16383
Dest N7:25
0
CLEAR
Dest S:5
0
PID
Control Block N7:2
Process Variable N7:0
Control Variable N7:1
Control Block Length 23
END
] [
T4:0
DN
] [
N7:2
13
PID
TON
GRT
NEQ
MUL
DDV
CLR
Cycle Time of Output
Time Proportioning
Output Contacts
Control Variable
Output as a Fraction of
Cycle Time
Clears Minor Error Flag
PID Instruction
Done Bit

Allen-Bradley SLC 500 Series Specifications

General

Programming Software	RSLogix 500
Series	SLC 500
Category	Controller
Manufacturer	Allen-Bradley (Rockwell Automation)
I/O Capacity	Up to 4096 I/O points
Communication Ports	DH-485
Programming Languages	Ladder Logic
Operating Temperature	0 to 60 °C (32 to 140 °F)
Relative Humidity	5% to 95% (non-condensing)
Memory	4K to 64K words (depending on the processor)
Power Supply	AC or DC (depending on the module)