Panasonic FP2

FP2 Serial Data UnitConfirming the Unit Settings and Design Contents
3 − 10
3.3 Confirming the I/O Contacts and Slot Number
3.3 Confirming the I/O Contacts and Slot Number
3.3.1 The Role of Input/Output Contacts
The serial data unit has input/output contacts which enable communication with the
CPU unit.
These contacts play various roles, such as handling operations when data is output
from the RS232C port, and alerting the CPU unit when sending and reception have
been completed.
The contacts are turned on and off from the CPU unit, which also controls the timing of
serial communication being carried out by the serial data unit.
FP2
CPU unit
FP2 serial data unit
Output contact (Y)
Input contact (X)
Output contact (Y): sends operation directives from the CPU unit to the serial data unit.
Sending directives, Received buffer clear, Software reset
Input contact (X): Notifies the CPU unit of the serial data unit status.
Sending completed flag, Reception completed flag
Framing errors, Parity errors, Buffer full errors, Reception message length
error, Sending message length error, Software reset completed flag
For information on detailed functions of input/output contacts, refer to section 7.3.
3.3.2 Allocation of I/O Contacts
Like other units, the FP2 serial data unit also allocates inputs (X) and outputs (Y). Each
serial data unit has 16 inputs and 16 outputs, for a total of 32 contacts.
Example:
When the serial data unit is installed in slot 0
SDU
SD RD ERR SD RD ERR AL
COM.1
COM.2
COM.1(RS232C)
COM.2(RS232C)
Occupied points
32 points
Output 16 points
Input X0 to XF(WX0) Output Y10 to Y1F(WY1)
Input 16 points