Delta RMC101 - Manual (Page 381)

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)
C 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