Prosoft-technology MVI69-MCM Uživatelský manuál stáhnout pdf (Strana 72)

Ladder Logic MVI69-MCM ♦ CompactLogix or MicroLogix Platform

User Manual Modbus Communication Module

Page 72 of 167 ProSoft Technology, Inc.

March 22, 2011

The Backplane Fail Count (page 52) parameter determines if the module should

continue communicating on the MODBUS network when the backplane transfer

operation fails. A value of zero indicates that the module should continue

communicating when the backplane is not operational. If the value is greater than

zero, the backplane will be retried the entered number of times before a failure

will be reported and communication will cease on the ports. When backplane

communication is restored, the module will start communicating on the network.

For example, if you enter a value of 10 for the parameter, the module will stop all

MODBUS communications if 10 successive backplane errors are recognized.

When a successful transfer is recognized, the module will resume

communications on the network.

The Error/Status Block Pointer (page 52) parameter defines the location in the

module’s database where the error/status data will be stored. If the value is set to

-1, the data will not be stored in the user data area. A value between 0 and 4939

will cause the module’s program to store the data at the specified location.

3.2.1 Status Object (MCM1Status)

This object views the status of the module. The MCM1Status object shown

below is updated each time a read block is received by the processor. Use this

data to monitor the state of the module at a "real-time rate".

Name Data Type Description

Pass_Cnt INT

Prod SINT[4]

Rev SINT[4]

Op SINT[4]

Run SINT[4]

PortErr MCM1_PORT_ERROR[2]

BlkStats MCM1_BLK_STATS

Port1_CurErr INT

Port1_LastErr INT

Port2_CurErr INT

Port2_LastErr INT

Refer to Status Data for a complete listing of the data stored in this object.

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 166 167

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Prosoft-technology MVI69-MCM Uživatelský manuál Strana 72