1C31233G01 Analog input module

For example, IF: 1 A slave fails to respond to a command within the specified RESPONSE TIMEOUT (page 58); 2 And, the specified number of RETRIES (page 58) also fail; 3 And, the ERROR DELAY COUNTER (page 58) is greater than 0; THEN: 

1 The module will set the Slave Status register for that address to a value of 3 to prevent further polling of that slave. 

2 The value in the ERROR DELAY COUNTER parameter will be added to an internal countdown register. 

3 Each time a command addressed to the disabled slave is to be executed from the Command List, the command will be skipped instead of sent. 

4 The internal countdown register will be decremented by one (1) each time a command is skipped.

5 When the internal countdown register decrements to zero (0), the Slave Status register for that slave will be set to a value of one (1), which will allow a command to be sent in an attempt to re-establish communication with the slave

The Slave Disable and Slave Enable Special 

Control Blocks can be used to access the Slave Status table and control slave polling through ladder logic by forcing values into the Slave Status table in a manner similar to how the module's internal firmware operates automatically. Using the Disable control will force a value of three (3) into the internal module register that holds the Slave Status information for that port and slave address. In this situation, when a Slave Status register is set to three (3), the slave at the corresponding address will not be polled, even if there are commands in the Command List that are enabled and addressed to that slave. Since the ERROR DELAY COUNTER is not involved in this operation, the status register will remain set to 3, disabling the slave, until it is re-enabled with the Enable control.

Using the Enable control will force a value of one (1) into the table. 

When a Slave Status register is set to one (1), the slave at the corresponding address will be polled as specified in the Command List.Port 1 slaves can be disabled using block code 3000 and can be enabled using block code 3001. Port 2 slaves can be disabled using block code 3100 and can be enabled using block code 3101. Each output (Write) block can contain a list of up to 59 slave addresses to disable or enable.

The module will respond with an input image block with the same identification code and indicate the number of slaves disabled by this function.

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