Watson-Marlow qdos30 - PROFIBUS Data Exchange

8 bit Byte 7 Fail Safe
8 bit Byte 8 Fail Safe Speed (Low byte of 16-bit unsigned)
8 bit Byte 9 Fail Safe Speed (High byte of 16-bit unsigned)
Set Min/Max Speeds
The Min/Max Speed parameters are used to set the minimum and maximum speed from the
PROFIBUS interface. The values are only used if the matching bit in the Control Word is
enabled and they are not zero. The values are 16 bit unsigned in 1/10th of RPM of the head
speed.
If the user requests the pump to operate at a lower speed than the defined minimum speed
from the user parameter data (bytes 3, 4) then the pump will operate at the defined
minimum speed.
If a maximum speed has been configured in the user parameter data, then the pump will be
limited to this maximum speed even when the master requests a higher rpm.
Fail Safe
The fail-safe user parameter is used to set the correct course of action to take in the event
of a PROFIBUS communications failure. The fail-safe byte is configured as shown in the
following table. If no bits are set or an invalid bit pattern is set the default fail safe
behaviour shall be to stop the pump.
Hex Description
0x00 The pump will stop
0x01 Continue driving using the last demanded speed
0x02 Continue driving using the fail safe speed
0x03 - 0x07 Reserved
Fail Safe Speed
The fail-safe speed parameter is used to set the speed at which the pump should be driven
if a PROFIBUS communications error occurs and if the fail-safe user parameter is set to
0x02.
17.5 PROFIBUS data exchange
The data in this section is provided as reference material for a PROFIBUS network operator.
Operating this pump under PROFIBUS control is beyond the scope of this instruction
manual. Consult your PROFIBUS network literature for further information.
Default address 126
PROFIBUS Ident 0x0E7D
GSD File: WAMA0E7D.GSD
Config: 0x62, 0x5D (3 words out, 14 words in)
User parameter bytes: 6
Cyclic Data Write (from Master to pump)
Cyclic Data Write (from Master to pump)
16 bit Byte 1 (low), 2 (high) Control Word
16 bit Byte 3 (low), 4 (high) Pumphead Speed Setpoint (unsigned)
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