Chapter 5: Device Allocation Of Pid Module; Program Size; Valid Devices; Control Register - IDEC FC5A-F2M2 User Manual

D A PID M
EVICE LLOCATION OF

Program Size

The user program size that the PID module uses depends on CPU module type. The table below shows the
program size required to use a PID module.
Both CH0 and CH1 are in fixed value
All-in-one Type 1,300 bytes
Slim Type 1,200 bytes

Valid Devices

The following devices can be allocated as the control register and relay for the PID module. Control register
and relay should be configured for each PID module. Duplicated device cannot be configured.

Control Register

Control Relay
Control Register
The PID module occupies a maximum of 590 data registers (minimum 190 data registers) per PID module. The
occupied number of data registers varies between the fixed value control mode and program control mode.
When both CH0 and CH1 are in fixed value control mode, 190 data registers are occupied, including the first
data register designated. When either CH0 or CH1 is in program control mode, 590 data registers are occupied,
including the first data register designated.
Precautions when Connecting Four PID Modules to All-in-One Type CPU Module
2000 data registers (D0 to D1999) are allocated to the all-in-one type CPU module. When four PID modules
are connected to the all-in-one type CPU module, a maximum of six program controls can be conducted with
three PID modules among the four PID modules.
The configurations shown in the examples 1 and 2 are not possible because the total number of occupied data
registers exceeds 2000.
Example 1: Program control mode is selected in all four PID modules
Module Type
FC5A-F2MR2/FC5A-F2M2 Program control mode
FC5A-F2MR2/FC5A-F2M2 Program control mode
PID Module
FC5A-F2MR2/FC5A-F2M2 Program control mode
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode
Example 2: Program control mode is selected in all four PID modules
Module Type
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode
PID Module
FC5A-F2MR2/FC5A-F2M2 Program control mode
FC5A-F2MR2/FC5A-F2M2 Program control mode
The configurations shown in the example 3 and 4 are possible because the total number of occupied data
registers is less than 2000.
Example 3: Program control mode is selected in three PID modules
Module Type
FC5A-F2MR2/FC5A-F2M2
FC5A-F2MR2/FC5A-F2M2
PID Module
FC5A-F2MR2/FC5A-F2M2
FC5A-F2MR2/FC5A-F2M2
5-2
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ODULE
Program Size
control mode
I Q M R T C
– – – – – –
– – X – – –
Type No.
CH0
Type No.
CH0
Type No.
CH0
Program control mode
Fixed value control mode
Program control mode
Fixed value control mode
FC5A MicroSmart PID Module User's Manual FC9Y-B1283
CH0 or CH1 is in program control mode
4,400 bytes
3,900 bytes
D Constant
X –
– –
Control Mode
CH1
Program control mode
Program control mode
Program control mode
Program control mode
Total
Control Mode
CH1
Program control mode
Program control mode
Fixed value control mode
Fixed value control mode
Total
Control Mode
CH1
Program control mode
Program control mode
Program control mode
Fixed value control mode
Total
Occupied
Data Register
(Word)
590
590
590
590
2360
Occupied
Data Register
(Word)
590
590
590
590
2360
Occupied
Data Register
(Word)
590
590
590
190
1960