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63Chapter 4 Configuration with Logicmaster 90–70
In a dual bus system, if the Remote Drop will be located downsteam of
another device that controls bus switching (either a Bus Switching
Module or another Remote I/O Scanner), set this entry to YES.
If either of the previous two entries is YES, and the total bus scan time
is expected to exceed 100mS, set this entry to 10. This entry is
equivalent to the Switch Time entry made for the Bus Controller. It is
the amount of time that will be allowed for switching on a dual bus.
The choices are 2.5 seconds and 10 seconds. If the Remote I/O Scanner
stops receiving output data from the Bus Controller, it will wait for this
specified time period before defaulting outputs in the Remote Drop.
After establishing the configuration for the Remote Drop, set this entry
to YES to prevent changes.
This entry determines the CPU redundancy mode of the system. For
most applications, it will be NONE, for no CPU redundancy. The other
choices are Hot Standby and Duplex. See the Bus Controller User’s
Manual for details. The Remote I/O Scanner can only be configured for
Duplex CPU redundancy if all of its modules are discrete.
If the entry for Redund Mode above was Duplex, the Remote I/O
Scanner will operate in Duplex mode. It will accept output data from
two Bus Controllers, and compare the corresponding outputs. If the
two outputs match, the Remote I/O Scanner sets the output to the
commanded state. If they do not match, the Remote I/O Scanner sets
the output to this configured default state. All outputs in the Remote
Drop will use this same default state.
Set this entry to YES if the Remote I/O Scanner will be a redundant
device on the bus of its bus controller. The bus controller must also be
set up for redundancy. Setting this to YES causes the configuration of
this Remote I/O Scanner to be automatically associated with any
“matching” internal bus controller.
SNP Port Entries
These are the SNP port communications parameters. If the Remote I/O Scanner will be
part of a Serial Network Protocol system, these parameters must be set to match the
SNP parameters of the PLC.
Defaults to 19200 bps. The other choices are 300, 600, 1200, 2400, 4800,
and 9600 bits per second.
The number of parity bits added to each word. The default is ODD.
You can also choose EVEN and NONE.
All communications use at least 1 stop bit, which is the default. For
slower communications, select 2.
The modem turnaround time delay. 1 count = 1/100 second. 0 to 255
counts can be specified. The default is 0.
The maximum communications idle time, which can be 1 to 60
seconds. The default is 10 seconds.
For multidrop communications, a unique SNP ID is required for each device in the
network. A Remote I/O Scanner automatically sets its SNP ID to the form DropXXX
BSM Present
Timeout Sec
CFG Protect
Redund
Mode
Duplex Def
Redundan-
cy?
Baud Rate
Parity
Stop Bits
Modem TT
Idle Time