GE FVP110 - Definition of Combining Function Blocks; Execution Schedule of the FVP110 Function Blocks

FVP 110 Fieldbus Valve Positioner Manual
92
GE Energy
Definition of Combining Function Blocks
The input/output parameters for function blocks are combined. Practically, the setting is
written to the FVP110 link object. See “Block Setting” on page 96 for details.
For the FVP110, in order to minimize the delay in data transfer between Transducer block
and AO function block, transducer blocks are designed to execute in conjunction with the
execution of AO function block. Therefore, in order to activate Transducer block, it is
necessary that AO function block is always defined in the schedule.
Execute the combined blocks synchronously with other blocks on the communications
schedule. In this case, change the FVP110 schedule according to Table 14. FVP110
schedule is set as shown in Table 14; change it as necessary.
Maximum execution times are:
❑ 95 ms for AO block
❑ 40 ms for each DI block
❑ 95 ms for an OS block
❑ 120 ms fora PID block.
For scheduling of communications for combination with the next function block, the
execution is arranged to start after a lapse of longer than the times above mentioned. Two
FVP110 function blocks cannot execute at the same time (execution time is overlapped).
Table 14 Execution Schedule of the FVP110 Function Blocks
Index Parameters Setting (Enclosed is factory-setting)
269
(SM)
MACROCYCLE_
DURATION
Cycle (MACROCYCLE) period of control or
measurement. Unit is 1/32 ms. (32000 = 1 s)
276
(SM)
FB_START_ENTRY.1 AO block startup time. Elapsed time from the
start of MACROCYCLE specified in 1/32 ms.
(32000 = 1 s)
278
(SM)
FB_START_ENTRY.2 -
.
.
.
289
(SM)
FB_START_ENTRY.14 -