Metasys TC-9100 Series - Configuration Parameters for Controller Algorithms; Controller Override Mode Priorities

28 Technical Bulletin—TC-9100 Universal Controller
Controller Override Mode Priorities
The PI controller and on/off controller output may be overridden by one
of several Override modes, which are described elsewhere in this manual.
The priorities of these Override modes are:
Table 10: Override Priorities
Priority Mode
1 (highest) Manual OFF Fan Override (3-speed fan control)
2 Low Limit (Anti-freeze) mode
3 OFF mode (from window open or supervisory system shutoff)
4 Startup (from supervisory system)
5 Air Quality / Override mode (from digital input)
Note 1: The Manual OFF Override mode must not be enabled in the
controller which is connected to the 3-speed fan output module.
Note 2: If the Low Limit mode is enabled in the controller which is
connected to the 3-speed fan output module, then the Low
Limit mode effectively has the highest priority as the fan will
run at high speed in Low Limit mode, overriding a Manual
OFF Override mode, if active.
The parameters to be defined for each programmable module using one of
the controller algorithms are listed below. Refer to Appendix 2 –
Worksheet 2, or Appendix 1 – Table 1: Item List, for the Item addresses.
In the table below, x in the PM Tag name is the programmable module
number from 1 to 6.
Table 11: Programmable Module Configuration Items for
Controller Algorithms
PM Tag Alg
Tag
Type Description
PMxK1 LSP Number
Local Set Point: basic parameter for the working
set point.
PMxI1@ PV@ Connec-
tion
Process Variable Source:
01 (hex) = Analog Input 1 (AI1).
⇓
1B (hex) = External Analog Input 6 (XAI6).
PMxI2@ RS@ Connec-
tion
Remote Set Point Source: (The value of RS = 0 if
the connection = 00)
01 (hex) = Analog Input 1 (AI1).
⇓
1B (hex) = External Analog Input 6 (XAI6),
or the Item address of any other “Number” type Item
may be entered.
PMxI3@ RV@ Connec-
tion
Reference Variable Source: (The value of RV = 1 if
the connection = 00). The Item address of any
“Number” type Item may be entered.
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Configuration
Parameters for
Controller
Algorithms