5.2.8 Digital setpoint & Servo Pump (operating mode -7)
Usable with S300 and S700 only.
PZD 1 PZD 2 PZD 3 PZD 4 PZD 5 PZD 6
STW
Pressure
setpoint
Volume-flow
setpoint
---
ZSW
Pressure actual
value
Volume-flow
actual value
Current actual
value
Actual position
Bits 16...32
Actual position
Bits 0...15
The 16-bit values for the pressure setpoints/actual pressure values are specified in 10 mBar inter
-
vals.
The 16-bit values for the volume-flow setpoint/volume-flow actual value are specified in 0.1 l/min
intervals.
When operating mode -7 is activated, QENA is automatically set to 1. When switching to an operat-
ing mode other than -7, the servo pump is deactivated (QENA=0).
PNUs 1780...1820 see ASCII Object Reference
, group "Servo pump".
5.2.9 ASCII channel (operating mode -16)
Direction PZD 1 PZD 2 PZD 3 PZD 4 PZD 5 PZD 6
Controller to Amplifier STW 10 bytes of ASCII-data
Amplifier to Controller ZSW 10 bytes of ASCII-data
The operating mode “ASCII-channel” is used for parameterizing the servo amplifier.
With this channel, just as with any terminal program, ASCII data can be exchanged with the servo
amplifier via the RS232 interface. The control of the communication is performed by handshake bits
in the control and status words.
The assignment is as follows:
Bit 12:
Control word
Any transition edge on this bit informs the servo amplifier that valid ASCII data
are available in its process data input section, i.e. that with effect from this moment
valid data must have been entered into the PZD transmission section PZD 2 - PZD 6
by the control system.
Status word
The servo amplifier confirms that it has accepted the ASCII data, by a transition
edge on this bit.
Bit 13:
Status word
The servo amplifier uses a “1” in this bit to signal that the ASCII buffer now
contains valid data. A transition edge of Bit 14 in the control word
STW can be used to make the servo amplifier write the buffer contents to the
PZD reception section of the bus-master.
Bit 14:
Control word
Any transition edge on this bit requests the servo amplifier to write the contents
of its filled ASCII buffer to the receive process data of the bus master
Status word
The servo amplifier uses a transition edge on this bit to signal that the ASCII
buffer data have been written to the process data.
When transmitting ASCII data, you must observe:
1. Every ASCII command must be terminated by the “CR LF” character sequence.
2. If the ASCII command (with CR LF) is shorter than the 10 characters that are available,
then the rest of the telegram must be filled up with bytes with a content 0x00.
3. ASCII commands that are longer than 10 characters must be divided into more than
one telegram, whereby a maximum of 30 characters can be sent before the buffer
must be read out once.
PROFIBUS for S300/S400/S600/S700 43
Kollmorgen 04/2017 Process data channel
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