User Manual
<Appendix 4. PID Block>
A4-10
IM 01C50T02-01E
A4.19 Example of Block
Connections
PID
BKCAL_IN OUT
IN
AO
BKCAL_OUT
CAS_IN
AI
OUT
FA0406.ai
When conguring a simple PID control loop by
combining a YTA transmitter with a eldbus valve
positioner that contains an AO block, follow the
procedure below to make the settings of the
corresponding eldbus function blocks:
1. Connect the AI block and PID block of the YTA,
and the AO block of the valve positioner as
shown above.
2. Set MODE_BLK.target of the PID block to
O/S, and then set GAIN, RESET, and RATE to
appropriate values.
3. Check that the value of MODE_BLK.actual of
the AI block is Auto.
4. Set MODE_BLK.target of the AO block to
CAS|AUTO (meaning "Cas and Auto").
5. Check that the value of BKCAL_IN.status of the
PID block is not Bad.
6. Check that the value of IN.status of the PID
block is not Bad.
7. Check that Auto is set in MODE_BLK.permitted
of the PID block.
8. Set MODE_BLK.target of the PID block to Auto.
When nishing all steps in order, the PID block and
AO block exchange the respective information and
initialize the cascade connection. Consequently,
the value of MODE_BLK.actual of the PID block
changes to Auto and automatic PID control starts.
A4.19.1 View Object for PID Function Block
Relative
Index
Parameter
Mnemonic
VIEW
1
VIEW
2
VIEW
3
VIEW
4
1 ST_REV 2 2 2 2
2 TAG_DESC
3 STRATEGY 2
4 ALERT_KEY 1
5 MODE_BLK 4 4
6 BLOCK_ERR 2 2
7 PV 5 5
8 SP 5 5
9 OUT 5 5
10 PV_SCALE 11
11 OUT_SCALE 11
12 GRANT_DENY 2
13 CONTROL_OPTS 2
14 STATUS_OPTS 2
15 IN 5
16 PV_FTIME 4
17 BYPASS 1
18 CAS_IN 5 5
19 SP_RATE_DN 4
20 SP_RATE_UP 4
21 SP_HI_LIM 4
22 SP_LO_LIM 4
23 GAIN 4
24 RESET 4
25 BAL_TIME 4
26 RATE 4
27 BKCAL_IN 5
28 OUT_HI_LIM 4
29 OUT_LO_LIM 4
30 BKCAL_HYS 4
31 BKCAL_OUT 5
32 RCAS_IN 5
33 ROUT_IN 5
Subtotals 28 43 53 41