Proline Promass Q 300
24
Hauser
Function blocks
Block
Number
blocks
Execution times
Process variables (Channel)
Resource Block
(RB)
1
This Block (extended functionality) contains
all the data that uniquely identify the device; it
is the equivalent of an electronic nameplate
for the device.
–
Analog Input
Block
(AI)
8
7 ms
Process variables (AI Channel)
• Temperature (7)
• Volume flow (9)
• Mass flow (11)
• Corrected volume flow (13)
• Density (14)
• Reference density (15)
• Totalizer 1 (16)
• Totalizer 2 (17)
• Totalizer 3 (18)
• Carrier pipe temperature (51)
• Carrier mass flow (57)
• Target mass flow (58)
• Electronic temperature (65)
• Current input 1 (99)
Discrete Input
Block
(DI)
2
5 ms
• Switch output state (101)
• Low flow cut off (103)
• Empty pipe detection (104)
• Status verification (105)
PID Block
(PID)
1
6 ms
–
Multiple Analog
Output Block
(MAO)
1
5 ms
Channel_0 (121)
• Value 1: External
compensation variable,
pressure
• Value 2: External
compensation variable,
temperature
• Value 3: External
compensation variable,
reference density
The compensation
variables must be
transmitted to the device
in the SI basic units.
Multiple Digital
Output Block
(MDO)
1
5 ms
Channel_DO (122)
• Value 1: Reset totalizer 1
• Value 2: Reset totalizer 2
• Value 3: Reset totalizer 3
• Value 4: Flow override
• Value 5: Start heartbeat
verification
• Value 6: Status switch output
• Value 7: Start zero point
adjustment
• Value 8: Not assigned
Integrator Block
(IT)
1
6 ms
–
Modbus RS485
Protocol
Modbus Applications Protocol Specification V1.1
Response times
• Direct data access: typically 25 to 50 ms
• Auto-scan buffer (data range): typically 3 to 5 ms
