Delta RMC101 User Manual download pdf (Page 381)

100

101

Ethernet 5.2

Communications 5-131

on setting up the RECV and SEND instructions for details on what values to use for the Network,

Node, and Unit numbers when communicating with an RMC.

The RMC has 64K registers. When accessed by Omron PLCs, this data appears in Data Memory

(DM) registers D0 to D16383, and Extended Data Memory (EM) registers En_0 to En_6143,

where n is the bank number from 0 through 7. For CPUs that do not support some or all of these

Extended Data Memory Banks, the only functionality that will be lost is reading up complete plot

data. The CV500 PLC also cannot read data beyond D8191, however, the only feature that is lost

by this limitation is access to the Spline Download Area. See RMC Register Map (Omron FINS)

for details.

The Omron CS1 and CV PLCs use the Network Receive (RECV) and Network Send (SEND),

instructions to read and write registers in remote devices such as the RMC over FINS. The

Omron PLC instruction manuals are very well written and should suffice as a reference for setting

up this communication. However, a brief synopsis of each of these instructions is provided below,

followed by an example.

Network Receive: RECV(098) for CS1, RECV(193) for CV

This instruction is used to read data from the RMC's registers into the PLC's registers. It has the

following format:

RECV should be energized for only one scan to start the communication. After that, the

Communications Port Enabled Flag (A202.00 to A202.07 on the CS1 family and A502.00 to

A502.07 on the CV family) should be used to determine when the operation is complete, as

described in the Omron documentation. Each parameter is described below:

S First Source Word in Remote Node. Give the starting address to read from in the RMC. This

must be either a DM (Dnnnnn) or EM (Eb_nnnnn) address. The current extended data memory

bank on the RMC is always set to bank 0. Refer to the RMC Register Map (Omron FINS) topic for

exact addresses.

D First Destination Word in Local Node. Give the starting address in the PLC to store the data read

from the RMC. This is typically a DM address.

C First Control Word. This instruction uses a block of five control words. These words are used to

control the network communication itself. These five words are defined as follows:

Word

MSB (Bits 8-15)

LSB (Bits 0-7)

Number of words to read (1 to 512).

The PLC supports reads up to 990 words, but the RMC is limited to 512

words.

C+1

Always 00 for RMCs.

Remote Network Address.

For RMCs, this value should be

set to the address of the RMC's

Ethernet network.

C+2

Remote Node Number.

For RMCs, this value should be

Remote Unit Number.

For RMCs, this value should be

1 2 ... 376 377 378 379 380 381 382 383 384 385 386 ... 950 951

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Delta RMC101 User Manual Page 381

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