Watson-Marlow MC100 - Manual (Page 17)

Users Manual
MC100
MC100 Users Manual Profibus DP - rev 4 Rev. 4 Page 17 of 40
7 Operating the MC100
7.1 Process Data Exchange (Cyclic data)
Due to limitations in the Profibus structure the data for the MC100 and the attached pumps are
multiplexed as described below.
Data are sent to and from the MC100 on a cyclic basis in a data package of 23 data word (each of 2
bytes). The MC100 acknowledge by returning a package of 23 data words.
The communications runs continuously – i.e. also if no parameters are changed.
7.1.1 Structure of the data package sent to and received from the MC100
Data sent to the MC100 (PLC
MC100):
Data
word no
Content Described in section
0 MC100 control bits 7.1.2
1 Control pump 1 and 2 7.1.4
2 Control pump 3 and 4 7.1.4
3 Control pump 5 and 6 7.1.4
4 Control pump 7 and 8 7.1.4
5 Control pump 9 and 10 7.1.4
6 Control pump 11 and 12 7.1.4
8 Control pump 13 and 14 7.1.4
9 Control pump 15 and 16 7.1.4
10 Header for word 12 to 21 7.2.2
11 Header for special use 7.2.4
12 Volume data for the pump selected in word 0 – part 1 7.2.1
13 Volume data for the pump selected in word 0 – part 2 7.2.1
14 Tube used in the pump selected in word 0 7.2.1
15 Speed data for the pump selected in word 0 7.2.1
16 Acceleration data for the pump selected in word 0 7.2.1
17 Reverse data for the pump selected in word 0 7.2.1
18 Density data for the pump selected in word 0 – part 1 7.2.1
19 Density data for the pump selected in word 0 – part 2 7.2.1
20 Calibration data for the pump selected in word 0 – part 1 7.2.1
21 Calibration data for the pump selected in word 0 – part 2 7.2.1
22 Na
The data package will always consist of the control words for all possible pumps (word 1 to 9 – please
see above) regardless of the number of pumps attached to the MC100. The control for pumps which
are not present will be ignored.
The data are sent with the lowers number first i.e. from data word 0 to data word 22.