CMSX-...-C-U-F1-...
36
Festo – CMSX-...-C-U-F1-... – 1506a English
Opening direction (OPEN) - only CMSX-S-...- (rotary)
With the OPEN parameter, you specify in which direction the process valve opens. If the setting is cor
rect, the display shows the following as valve position (VP):
– With completely closed process valve: VP 0 %
– With completely opened process valve: VP 100 %.
The parameter OPEN influences the direction of rotation of the semi-rotary drive as well as the dis
played valve position (VP) and thus also the analogue signal at the actual value output. In addition, it
influences the position of the entries limit1, limit2, lmt1 and lmt2. Whether the process valve opens
with increasing or falling setpoint signal is determined by the parameter DIRECT.
Signal direction (DIRECT)
The parameter DIRECT establishes the signal direction for increasing the setpoint position (SP). The
setpoint position (SP) is raised either with increasing setpoint signal or with falling setpoint signal. The
parameter is effective independently of the character of the setpoint characteristic curve. For example,
the parameter is effective with a linear setpoint characteristic curve as follows:
1
Increasing setpoint signal (increase)
Decreasing setpoint signal (decrease)
2
0/4 mA
10 V
0 V
20 mA
1
Setpoint position SP in [%] (setpoint
position)
2
Setpoint value signal range – example
(SPMIN = 0 %; SPMAX = 100 %)
Fig. 25
Active direction of the setpoint signal on the setpoint position – example (here linear charac
teristic curve)
With the parameters SPMIN and SPMAX, the setpoint signal range can be restricted as needed
(
è
Tab. 18). Whether the process valve opens or closes is influenced through the OPEN parameter.
