Yaskawa LEGEND-MC - Manual (Page 185)

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LEGEND-MC User’s Manual
OB (Output Bit)
[I/O]
DESCRIPTION:
The OB n, logical expression command defines output bit n = 1 through 4 as either 0 or 1 depending on the
result from the logical expression. Any non-zero value of the expression results in a one on the output.
When using this command to access I/O on a slave controller in distributed control mode, use it with the
handle for outbound master commands. Do not use the handle which is for incoming slave update packets.
For example, if a slave is connected on handles E and F, reference the I/O for the slave on handle E.
This command also works for Modbus outputs.
ARGUMENTS: OB n, expression where
n is 1 to 4 for the local controller. However, remote local outputs can be used (i.e. Offset 100 per handle for
SMC outputs; Offset 1000 per handle for Modbus outputs)
expression is any valid logical expression, variable or array element.
USAGE:
MODBUS:
NOTE: When using Modbus devices, the I/O points of the modbus devices are calculated
using the following formula:
n = (SlaveAddress*1000) + (HandleNum*1000) + ((Module-1)*4) + (Bitnum-1)
Slave Address is used when the ModBus device has slave devices connected to it and specified as
Addresses 0 to 255. The use of slave devices for modbus are very rare and this number will usually be 0.
HandleNum is the handle specifier from A to P (1 - 16).
Module is the position of the module in the rack from 1 to 16.
BitNum is the I/O point in the module from 1 to 4.
EXAMPLES:
While Moving Yes Default Value ---
In a Program Yes Default Format ---
Command Line Yes
Can be Interrogated No
Used as an Operand No Distributed Control Offset 100
OB 1, POS 1 If POS1 is non-zero, Bit 1 is high. If POS1 is zero, Bit 1 is low
OB 2, (@IN[1]&@IN[2]) If Input 1 and Input 2 are both high, then Output 2 is set high
OB 3, COUNT[1] If the element 1 in the array is zero, clear bit 3, otherwise set bit 3
OB N, COUNT[1] If element 1 in the array is zero, clear bit N
OB 3003,(X<5) Set output 3 on Modbus device at handle "C" if X is less than 5,
otherwise turn off the output