A2 Historical Values - ABB 07CR41 Operating Manual

A2 Historical values
Advant Controller AC 31 / Issued: 08.99
Historical values are basic unit specific internal variables which enable the interim results of
results, which are required for numerous cycles, to be stored.
So that cycle N can be executed correctly, certain functions require the results obtained during
cycle N-1 (e.g. the PI and PIDT1 controllers).
The total number of available historical values in the 40 and 50 series is 256.
The following table contains a list of functions with the number of historical values which they
use:
Timer functions
ASV 1 (additional memory for the timers is restricted to 42 variables)
ESV 1 (additional memory for the timers is restricted to 42 variables)
MOA 1 (additional memory for the timers is restricted to 42 variables)
MOK 1 (additional memory for the timers is restricted to 42 variables)
PDM 1 (additional memory for the timers is restricted to 42 variables)
Counter functions
VRZ
CS31 bus functions
CS31CO
Communication functions
®
MODBUS
EMAS
DRUCK
SINIT
Controller functions
PI
PID
High order functions
BMELD
UHR
3
1
2
1
2
1
3
5
3 + number of inputs E
1
A – 3 Appendix
3