Add A Serial Remote I/O Master/Slave Module - Automationdirect.com DirectLOGIC DL205 Series User Manual

Chapter 4: System Design and Configuration

Add a Serial Remote I/O Master/Slave Module

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In addition to the I/O located in the local base, adding remote I/O can be accomplished via a
shielded twisted-pair cable linking the master CPU to a remote I/O base. The methods of
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adding serial remote I/O are:
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240
• DL240 CPUs: Remote I/O requires a remote master module (D2–RMSM) to be installed in the
250-1
local base. The CPU updates the remote master, then the remote master handles all communication
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to and from the remote I/O base by communicating to a remote slave module (D2–RSSS) installed
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in each remote base.
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• DL250–1 and D2–260 CPU: The CPU's comm port 2 features a built-in Remote I/O channel. You
may also use up to 7 D2–RMSM remote masters in the local base as described above (you can use
either or both methods).
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Maximum number of Remote Masters supported in the local
6
CPU base (1 channel per Remote Master)
CPU built-in Remote I/O channels
Maximum I/O points supported by each channel
7
Maximum Remote I/O points supported
Maximum number of remote I/O bases per channel(RM–NET)
8
Maximum number of remote I/O bases per channel (SM–NET)
Remote I/O points map into different CPU memory locations, therefore it does not reduce
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the number of local I/O points. Refer to the DL205 Remote I/O manual for details on
remote I/O configuration and numbering. Configuring the built-in remote I/O channel is
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described in the following section.
The figure below shows one CPU base, and one remote I/O channel with six remote bases. If
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the CPU is a DL250–1 or DL260, adding the first remote I/O channel does not require
installing a remote master module (use the CPU's built-in remote I/O channel).
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13
7 per CPU base (DL250-1 & DL260)
(for DL250-1 & DL260 the bottom port of
the CPU can serve as an eighth master)
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A
B
C
D
4–26
DL205 User Manual, 4th Edition, Rev. B
Remote Masters
Maximum of:
2 per CPU base (DL240)
Remote Slaves
Maximum of
7 remote bases
per channel
DL230 DL240 DL250–1 DL260
none 2
none none
none 2048
none Limited by total references available
none 7
none 31
Masters can go in any slot except next to CPU.
Allowable distance is from farthest slave to the remote master.
7 7
1 1
2048 2048
7 7
31 31