5 Function blocks
5.25 PO, pulse output
232
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
Figure 166:PO pulse output - possible phases of Normal mode
EN: Enable coil
S: Start coil for pulse sequence
FO: Start frequency, FS = Operating frequency,
m1 = Acceleration phase, m2 = Operating phase, m3 = Braking phase
AC: Pulse sequence applied at device output, contact
BR: Stop coil for pulse sequence
Q1/2: Pulse sequence at the device output Q1 and/or Q2
• Range A: The pulse sequence is present at the device output until the number of pulses defined at
I1 has been reached.
• Range B: Activating the coil PO..BR initiates the braking phase and reduces the frequency of the pulse
sequence.
• Range C: A voltage drop at coil PO..EN immediately switches off the pulse sequence from the device
output.
The function block calculates the required number of pulses for the
acceleration and braking phase with the following formula:
FS = Start frequency [Hz], FO = Operating frequency [Hz]
n = Total number of pulses for the entire distance
n
1
= Number of pulses in acceleration phase
n
3
= Number of pulses in operating phase
RF = Frequency change in the acceleration phase [mHz/step]
BF = Frequency change in the braking phase [mHz/step]
Acceleration phase
Braking phase
n
1
=
(FO - FS)
.
1000
n
3
=
(FO - FS)
.
1000
RF
BF
A
B
C
Q1/2
BR
AC
FS
FO
0
EN 0
1
1
m3
m2
m1
S
