Delta RMC101 Manual do Utilizador descarregar pdf (Página 505)

100

101

Serial (RS-232/422/485) 5.5

Communications 5-255

500CPU Read, or 500CPU Write. The type of PLC selected is not important, but the

Read or Write determines whether you will read registers from the RMC or write

registers into the RMC.

• Data Table Address: Enter the address of the first Allen-Bradley PLC register to read

RMC registers into, or to write to RMC registers from.

• Size in Elements: Enter the number of RMC registers to read or write in this field. The

MicroLogix can transfer 1 to 41 integers.

• Channel: Set this to the channel number of the serial port you want to use. The

MicroLogix 1500 LRP Series B can use either channel 0 or 1, but all other MicroLogix

PLCs will always use channel 0.

• Target Device: This section holds parameters for the target device.

• Message Timeout: Indicate the number of seconds to wait for the RMC to respond

before determining that the attempt failed. This can be set as low as a few seconds.

• Data Table Address: Enter the address of the first RMC register to read or write in this

field. See the RMC Register Map (Allen-Bradley) for help on addresses.

• Local Node Addr (dec): Enter the node address of this RMC. The node address of the

RMC is set up in the Serial Module Options dialog box, which is described in

Configuring the RMC SERIAL. The node address entered on that screen is in decimal,

so it is recommended that you enter the same number in the dec field.

• Local/Remote and Bridge Parameters: In most applications these will be set to Local

and there will be no bridge parameters. If you are using a bridge then these parameters

will need to be used. However, this is beyond the scope of RMC documentation. Refer

to your Allen-Bradley documentation for instructions on using these fields.

Using the MSG Block in Ladder Logic

The Allen-Bradley MSG block takes multiple ladder scans to complete. Therefore, it is important

to enable the MSG block for the correct amount of time. Specifically, the MSG block must be

energized until the message control's enable (EN) bit turns on. Delta has found some aspects of

this to be difficult and therefore has provided the following ladder samples:

Read or Write Continuously

Using the Examine If Open instruction as shown below fulfills two requirements of continuous MSG

transactions. First, it will keep the block energized until the EN turns on, and second, it de-energizes

the MSG block once the transactions is started so that when the transaction is completed (EN goes

low again), the MSG block sees a rising edge on its input, thus repeating the transaction:

1 2 ... 500 501 502 503 504 505 506 507 508 509 510 ... 950 951

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