ATI
MetriNet Ethernet/IP Communications Manual
21
O&M Manual
Rev-A (6/19)
Notes on INFO data –
Format for INFO data is as follows (assumes Q32P pH sensor) -
Value
Field
Meaning
1000
Slope
100.0%
50
Offset
5.0 mVDC
10
Delay
1.0 minutes
700
Alarm A
7.00 pH setpoint
800
Alarm B
8.00 pH setpoint
800
Slope Alarm
80.0% low alarm
1000
Timer Limit
?
1400
Vout HI
14.00 pH = 2.5 VDC (virtual)
0
Vout LO
0.00 pH = 0 VDC (virtual)
0
TC Mode
?
10
Tag1
11
Tag2
Output Assembly Object (04
HEX
– 1 Instance)
The Output Assembly Object is a collection of all the information that can be written
to the MetriNet. As the MetriNet has a fully interactive user interface with an LCD
and keypad, it is expected that the vast majority of changes made to the sensors
and system will be performed by trained technicians at that user interface on the
actual MetriNet. While making changes digitally at the network level are possible,
these “blind” calibration attempts over the network are not recommended. Network
changes to the system ignore the typical sensor visual inspection process that
occurs during typical calibration or adjustment. For example, sensors should
always be removed, inspected, and then cleaned before calibration in solutions.
This is pretty standard GMP procedure.
Even so, a secure password-protected write-window is provided to allow the user
to change the majority of the parameters that are seen in the Input Assembly
Object. To enter data to change these values, all values are entered through a 5-
register window with specific codes to tell the system which sensor the operation
is targeting So, this is the “write only” data window. The data arrangement is
detailed below, including byte size of various fields. Using the EDS file for the
MetriNet, all of the data information can be immediately setup automatically in the
network master/client.
