User`s manual

Maxiflex T2 CPU User Manual 29 -© Omniflex
UMM124XBR04.pdf
3. Press the “Read Current Group” button to read the CPU’s current status to the
screen.
4. Check the first item in the group – the I/O Manifest Key. Change this key to
“Locked” if it is “Unlocked”.
5. Press the “Write Current Group” button to write the “Locked” value to the T2
CPU.
6. Write the required module type to each item in the I/O list.
7. Press the “Write Current Group” button to write this information to the T2 CPU.
This sets the list of modules in the manifest table.
6.1.2 Checking the Status of installed modules
Once the I/O manifest has been set and “locked”, check the I/O module configuration
by following this procedure:
1. Change to the “I/O Module Status” Group.
2. This list shows the currently installed list of modules, and will change dynamically
as I/O modules are removed and installed. The “I/O Bit Status” register identifies
the mismatches between this list and the I/O manifest just created. Each bit set to
1 indicates a mismatch in the corresponding module position. Bit 16 represents the
summary of all other bits in the word. If all 15 modules match, (showing 0), then bit
16 will be 0. If any of the modules does not match, then this bit will be set to 1.
6.1.3 I/O Status Indication
The I/O OK indicator on the front of the module reports the status of the I/O modules
as follows:
If the manifest is “unlocked”, then the I/O OK indicator will be OFF.
If the manifest is “locked” and the installed modules matches this list, then the I/O OK
light will be ON.
If the manifest is “locked” and the installed modules do NOT match this list, then the
I/O OK light will be flashing.
6.2 Automatic I/O Scanning
Input status information is automatically read from the Input modules and stored in the
CPU’s Dynamic Data area of the DIT Table.
Output status information is automatically read from Dynamic Data area of the DIT Table
and written to the relevant output modules.
By placing the I/O dynamic data into the CPU’s DIT, access to the system I/O from the
network will be optimised. This is because similar types of data are grouped together
reducing the number of network read/write requests, and because the CPU’s dynamic data
area is the fastest area to read/write.
The table below identifies the DIT register locations in the CPU’s Dynamic Data Area of the
DIT where the I/O scanning stores/retrieves its data.