1C31227G02 analog output module

Database address 0 to 479 will be continuously transferred from the module to the processor. Database address 480 to 959 will continuously be transferred from the processor to the module. The Block Transfer Size parameter basically configures how the Read Data and Write Data areas are broken down into data blocks (60, 120, or 240).After the last Read Block is sent, the module builds an output image (ID = 0) to transfer the module’s status information to the processor. This information can be used by the PLC program to determine the current status of the module. Ladder logic should be constructed to transfer the information in this block to a user data file. The structure of this block is shown in the following table.

Special Control and Status Blocks 

Control and Status blocks are special blocks used to control the module or request special data from the module. The current version of the software supports eight types of special blocks.
Slave Disable and Enable blocks (page 121) (only for Master port or ports)
Slave Status blocks (page 124) (only for Master port or ports)
Event Command blocks (page 125) (only for Master port or ports)
Command Control blocks (page 127) (only for Master port or ports)
Pass-Through blocks (page 129) (only for Slave port or ports)
Initialize Output Data blocks (page 133) (all configurations)
Warm Boot block (page 133, page 89) (all configurations)
Cold Boot block (page 133) (all configurations)

Slave Disable and Enable Control Blocks

 For a variety of reasons, it may be desirable to disable and enable polling of certain network slaves using logic control from the processor. For these instances, you can use the Slave Disable and Slave Enable Special Control Block codes, along with a list of slave addresses to disable or enable. When a port is configured as a Modbus Master, the module maintains a 256- word memory table that reserves one word for each possible Modbus slave address (see Slave Status (page 124)). This memory table is used by the module's operating firmware as a 'scratch pad' to hold the polling state of each Modbus address, to see whether or not that address is currently being polled or whether or not that address can be polled.

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