Application Examples; Example: Process Data With Pdo - Danfoss MCA 123 POWERLINK Operating Instructions Manual

Application Examples

8 Application Examples

8.1 Example: Process Data with PDO 23

This example shows how to work with PDO 23, which
consists of Control Word/Status Word and Reference/Main
Actual Value. In the example the frequency converter is set
From controller
From frequency
Byte #
Table 8.1 Example of FC Profile
The application requires monitoring of the motor torque
8 8
and digital input, so PCD 2 is set up to read the current
motor torque. PCD 3 is set up to monitor the state of an
external sensor via the process signal digital input. The
sensor is connected to digital input 18.
An external device is also controlled via control word bit
11 and the built-in relay of the frequency converter.
Reversing is permitted only when the reversing bit 15 in
the control word and the digital input 19 are set to high.
For safety reasons, the frequency converter stops the
motor if the POWERLINK cable is broken, the master has a
system failure, or the PLC is in stop mode.
Illustration 8.1 Application Example
42
0
CTW
04 7C
STW
07
0F
converter
1 2
Recieve PDO's (PLC Drive)
→
PCD 0 PCD 1
CTW REF
Transmit PDO's (Drive PLC )
→
PCD 0 PCD 1 PCD 2 PCD 3
STW MAV Torque [Nm] Digital Inputs
MG92C102 - VLT
MCA 123 POWERLINK Operating Instructions
to FC profile in 8-10 Control Word Profile. The PDO contains
up to ten objects, which can be programmed to monitor
process signals.
PCD
1
MRV
20 00
MAV
00
20
3 4
+
12
Sensor
18
20
-
+
13
Reversing
19
20 -
Relay
Ext. Device
04-05
230 VAC
®
is a registered Danfoss trademark
2
PCD[2]
00 00 00
PCD[2]
3F A6 00
5 6 7
3
PCD
00
PCD[3]
08
8