Initial Values For Tag Data And Operation Constants (Public Variables); Control Modes - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

Initial values for tag data and operation constants (public
variables)
The tag FB requires the initial value settings for tag data and operation constants (public variables).
The initial values for tag data and public variables of each tag FB part can be set on the "FB Property" window of the
engineering tool. ( Page 39 Setting Initial Values of FBs (FB Property))

Control modes

The tag FB has six control modes.
Switching the control modes switches the tag FB control to the manual operation, automatic operation, or cascade operation.
The following table lists the control modes.
Symbol Control mode
MAN MANUAL
AUT AUTO
CAS CASCADE
CMV COMPUTER MV
CSV COMPUTER SV
CASDR CASCADE DIRECT
The control mode can be switched with the faceplate of tag FB or M+P_MCHG. ( Page 338 M+P_MCHG)
Available control modes depend on the tag type. ( Page 588 Correspondence table of tag types and control modes)
Switching the control mode
■Control mode switching when the tag type is other than 2PIDH
There are no restrictions on the control mode switching.
■Control mode switching when the tag type is 2PIDH
The control mode can be switched to CASCADE DIRECT (CASDR) only from CASCADE (CAS). There are no restrictions on
other control mode switching.
MAN
AUT
CMV
CSV
CAS
When the stop alarm (SPA) is TRUE, the control mode is automatically and forcibly switched to the MANUAL
mode. ( Stop alarm (SPA) overview)
1 PROCESS CONTROL FUNCTION BLOCK
20
1.3 Tag FB
Description
Performs the manual operation. The MV setting value is output.
Performs the automatic operation. The manipulated value is controlled on the basis of the SV
setting value.
Performs the cascade operation. The output value (MV) of primary loop is controlled as the setting
value (SV).
Performs the manual operation with the host computer. The MV setting value of the host computer
is output.
Performs the automatic operation with the host computer. The MV value is controlled on the basis
of the SV setting value of the host computer.
Directly outputs the output value of primary loop as that of secondary loop in the cascade
connection.
CASDR