User`s manual

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MELSEC-Q
9 CONTROL OPERATION INSTRUCTIONS
(2) Change rate limiter
In the change rate limiter, the following operation is performed and the result of the operation is
stored into the current rate value (Rn).
Condition Operation expression
(SPR R
n
) DR R
n
R
n-1
DR
(SPR R
n
)
DR R
n
R
n-1
DR
|SPR R
n
| DR R
n
SPR
(3) Rate operation
Rate operation is performed with the following operation expression.
BW
E1
BIAS
RMAX RMIN
R
n
RMIN
(4) Loop stop processing
(a) Setting 1 in SPA of the alarm detection (ALM) selects a loop stop.
A loop stop performs the following processing and terminates the S.R instruction.
1) BW retains the last value.
2) The operation mode (MODE) is changed to MAN.
(b) Setting 0 in SPA of the alarm detection (ALM) selects a loop run.
A loop run performs "(5) Control cycle judgment".
(5) Control cycle judgment
(a) When the specified control cycle is not reached, BW is retained and the S.R instruction is
terminated.
(b) When the specified control cycle is reached, "(6) Mode judgment" is performed.
(6) Mode judgment
Either of the following processings is performed depending on the operation mode (MODE)
setting.
(a) When the operation mode (MODE) is any of CAS, CCB and CSV
1) When the set value (E2) is specified, engineering value conversion is made with the
following expression and then "(2) Change rate limiter" is performed.
100
SPR
E2
RMIN
RMAX RMIN
2) When the set value (E2) is not specified, "(2) Change rate limiter" is performed without
engineering value conversion being made.
(b) When the operation mode (MODE) is any of MAN, AUT, CMV, CMB, CAB, LCM, LCA and
LCC, "(1) Tracking processing" is executed.
ERROR
• When an operation error occurs Error code: 4100