IDEC MicroSmart Pentra - Manual (Page 43)

D EVICE A LLOCATION OF PID M ODULE
5-2 FC5A MicroS mart PID Module User’s Manual FC9Y-B1283
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.
Program Size
Both CH0 and CH1 are in fixed value
control mode
CH0 or CH1 is in program control mode
All-in-one Type 1,300 bytes 4,400 bytes
Slim Type 1,200 bytes 3,900 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.
I Q M R T C D Constant
Control Register – – – – – – X –
Control Relay – – X – – – – –
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 Type No.
Control Mode Occupied
Data Register
(Word)
CH0 CH1
PID Module
FC5A-F2MR2/FC5A-F2M2 Program control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Program control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Program control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode Program control mode 590
Total 2360
Example 2: Program control mode is selected in all four PID modules
Module Type Type No.
Control Mode Occupied
Data Register
(Word)
CH0 CH1
PID Module
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Program control mode Fixed value control mode 590
FC5A-F2MR2/FC5A-F2M2 Program control mode Fixed value control mode 590
Total 2360
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 Type No.
Control Mode Occupied
Data Register
(Word)
CH0 CH1
PID Module
FC5A-F2MR2/FC5A-F2M2 Program control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Program control mode Program control mode 590
FC5A-F2MR2/FC5A-F2M2 Fixed value control mode Fixed value control mode 190
Total 1960