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Modbus Plus 5.3
Communications 5-187
2631 Axis 6 plot type
2632 Axis 7 plot type
Digital (Discrete) I/O Registers:
These registers indicate the current state of the digital inputs and outputs. These registers may
only be read; writes will be ignored, as this product does not support forcing inputs or outputs.
Because different PLCs label bit numbers differently, the following chart is provided to show the
mapping between the devices:
MSB
RMC bit
#
15 14
13
12
11
10
9
8
7
Modicon
bit #
1
2
3
4
5
6
7
8
9
The bit numbers listed in the table below are in RMC format (0 is LSB, 15 is MSB):
Modbus
Address
Register Description
2633
CPU Digital Inputs 0 and 1 in LSBs of low
byte, Outputs 0 and 1 in LSBs of high byte
2634
Unused
2635
Unused
2636
Sensor Digital I/O Inputs 0-15
2637
Sensor Digital I/O Inputs 16-17 (stored to two
LSBs)
2638
Sensor Digital I/O Outputs 0-7 in high byte
(low byte unused)
2639
Unused
2640
Unused
Plot Time Registers:
The Plot Time interval is configurable on the RMC. This interval indicates the number of control
loops between each sample in a plot. Therefore, if the control loop is 0.976ms (e.g. RMC100-M1),
this indicates roughly the number of milliseconds between samples. If the control loop is 1.953ms
(e.g. RMC100-M4), this indicates half of the number of milliseconds between samples.
These registers may be read or written. When read, they indicate the plot interval of the currently
gathered plot. When written, they set the plot interval the RMC should use for the next plot it will
gather. When the RMC starts the next plot, it copies the requested plot interval into the currently
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