5.10. COND2¶

Purpose

Compares the value from the first input channel with a set value. Furthermore, the comparison can be enabled/disabled depending on the logical condition of the second input channel.

Procedure

The (measured) value at the first input channel is compared with the set value. The type of comparison is chosen by the ‘Logical operator’. If the second input channel is TRUE, then the value of the condition is output. If the second output channel is FALSE, then the output is FALSE. Table 1 presents the possible scenarios for different input values.

Table 1: Possible scenarios

Scenario	condition	2nd input	Output
1	TRUE	TRUE	TRUE
2	FALSE	TRUE	FALSE
3	TRUE	FALSE	FALSE
4	FALSE	FALSE	FALSE

Parameters

Parameter	input	unit	default
Logical operator	LT (less than)/ GT (greater than)/ LE (less equal)/ GE (greater equal)/ EQ (equal)/ NE (not equal)
Set value	real
Reset time (true)	real	[s]	0
Reset time (false)	real	[s]	0

Remarks

If no logical signal line is attached to the second input channel it will default to TRUE and hence the COND2 will act identical to COND.

Examples

The example of COND is extended with the logical table LTAB to enable/disable the second (logical) input channel of COND2.

Fig 1: Control scheme

The input of LTAB is:

Time	On(1) Off(0)
	(-)
0	0
8.000	1.000
14.00	0
16.00	1.000

Figures Fig. 5.10.1 and Fig. 5.10.2 show the output when both ‘reset times’ are not used (0 seconds).