Micromod Micro-DCI: 53MC5000 PLC AND PRINTER INTERFACES - Manual (Page 47)

5.0 OPTO 22 MODE
5.1 PURPOSE
The OPTO 22 interface application performs data transfers between the Process Control Station
(PCS) and a system of OPTOMUX boards (stations) over the OPTO 22 serial I/O communication
system.
5.2 PCS DATABASE MAP FOR OPTO 22 MODE
The PCS database map for the OPTO 22 mode depicts the way the data from the actual boards of
the OPTO 22 serial I/O communication system is stored in the PCS memory. Unlike all other PLC
modes, the OPTO 22 database map is determined by the specific configuration of OPTO 22 hard-
ware.
As shown in Figures 5-1 and 5-2, the PCS database map is divided into three spaces as it follows
the OPTO 22 hardware:
1. Digital Boards 0 - 15
2. Digital Boards 16 - 31
3. Analog Boards 32 - 39
The user must follow certain rules as the database is defined:
• Board addresses must be contiguous and start with the lowest address of the group.
• The maximum combination of digital and analog boards for each DDI-A/B channel is 40
(addresses 0 - 39). This number cannot be exceeded and addresses above 39 should
not be used.
• Outputs on a board must be contiguous and start with module 0.
• Inputs must be contiguous and adjacent to the last output on a board.
It should be noted that the digital sections are fixed in the PCS database and that the analog sec-
tion varies according to the number of analog boards and modules per board. Also, that there are
no single, contiguous write and read spaces. Data to be read or written is gathered and deposited
from inputs and outputs stored all over the database map.
Section 5. OPTO 22 Mode
OPTO
5-1