L9P_ONOFF: ON/OFF Values for Deadband
(Original Document)
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Naming
Name in LL984 Editor
Function Block Name
name of legacy 984 instruction
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Function Description
The L9P_ONOFF DFB is used to control the output signal between fully ON and fully OFF conditions so that a user can manually force the output ON or OFF.
You can control the output via either a direct or reverse configuration:
Configuration
If Input...
Then Output...
Direct
< (SP - DB)
ON
> (SP + DB)
OFF
Revers
> (SP + DB)
ON
< (SP - DB)
OFF
Representation
Parameters
Input Pin
Name
Data Type
Address Range
Meaning
Top
ENABLE
BOOL
–
ON = enables process control function
Node
Node Type
Name
Data Type
Address Range
Meaning
Middle
IN/OUT
PAR
ARRAY[1...14] OF UINT
%MW
see Parameter PAR below
Bottom
IN
LEN
UINT
14
length of parameter block (can not be changed)
Output Pin
Name
Data Type
Address Range
Meaning
Top
OUT
BOOL
–
ON = operation successful
Bottom
ERR
BOOL
–
ON = operation not successful
Parameter PAR
The data type of the parameter block is ARRAY[1...14] of UINT
Word
Content
Format
1, 2
current input
REAL (Floating Point)
3
output status
UINT
4
input status
UINT
5, 6
set point, SP
REAL (Floating Point)
7, 8
deadband (DB) around set point
REAL (Floating Point)
9, 10
fully ON (maximum output)
REAL (Floating Point)
11, 12
fully OFF (minimum output)
REAL (Floating Point)
13, 14
output, ON or OFF
REAL (Floating Point)
Output Status
Control Expert-IEC bits
Function
0...4
standard output bits (flags)
5
1 = output set to ON
0 = output set to OFF
6
echo mode:
1 = manual override
0 = auto mode
7
1 = DB set to negative number
8...15
not used
Manual Override
2 bits in Input_Status are used for manual override. When bit 10 is set to 1, manual mode is enforced. In manual mode, a 0 in bit 9 forces the output OFF, and a 1 in bit 9 forces the output ON. The state of bit 9 has meaning only in manual mode.
Input Status
Control Expert-IEC bits
Function
0...8
not used
9
1 = force output ON in manual mode
0 = force output OFF in manual mode
10
1 = manual override
0 = auto mode
11
1 = reverse configuration
0 = direct configuration
12...15
standard input bits (flags)