Cyclic data read (from pump to master)
32 bit Byte 7 Tacho counter (high byte)
Byte 8 Tacho counter (low byte)
Byte 9 Tacho counter (high byte)
Byte 10 Tacho counter (low byte)
16 bit Byte 11 Pump outputs flow calibration in deci μl (For example: A value of 4
indicates 40μl) (high byte)
Byte 12 Pump outputs flow calibration in deci μl (For example: A value of 4
indicates 40μl) (low byte)
32 bit Byte 13, 14,
15, 16
Unassigned
32 bit Byte 17, 18,
19, 20
Unassigned
32 bit Byte 21, 22,
23, 24
Unassigned
32 bit Byte 25, 26,
27, 28
Unassigned
*Note – ‘Pumphead speed setpoint (unsigned)’, reports the speed that the pump is running in Profibus
mode.
This is reported as an integer in units of ‘rpm’ and will always be the same as the Profibus ‘pumphead
speed setpoint’ received by the pump.
Customers who wish to verify the flow rate of the pump should use the tacho counter, (which reports
pumphead revolutions where 10 increments = 1 revolution) and the µl per revolutions value (Byte 11,12)
to calculate flow.
For example, first reset tacho counter to zero then record change in readings over 1 minute, then:
Flow µl/min = (pumphead revolutions in 1 min) x µl per rev
= (Change in tacho count in 1 min /10) x µl per rev
Status word
Bit Description
0 Motor running (1 = running)
1 Global error flag (1 = error)
2 Fieldbus control (1 = enabled)
m-730un-en-08.1 43
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