MODEL: R7C
INDICATOR LED
■ STATUS INDICATOR LED
SD*1 RD
STATUS*2
PWR
ON
RUN ERR
ON BL
ON BL
BL ON Communicates normally with occasional CRC errors due to noise interference.
ON
BL ON Communicates normally but the Baud Rate and/or Station Address switches failed.
ERR LED blinks approximately in 0.5 seconds intervals.
ON
ON
ON
ON
ON
ON
ON
ON
ON BL
ON BL
ON BL
ON OFF
ON OFF
ON OFF
ON OFF
OFF BL
BL OFF ----
OFF ON CRC error found in the received data. Unable to respond.
OFF OFF ----
BL ON Normal communication
BL OFF ----
OFF ON Unable to receive data addressed to the station.
OFF OFF ----
BL ON Performs the interval-timed responses but CRC error found in receiving the refresh
data.
ON
ON
ON
ON
ON
ON
OFF BL
OFF BL
OFF BL
OFF OFF
OFF OFF
OFF OFF
BL OFF ----
OFF ON CRC error found in the data addressed to the station.
OFF OFF ----
BL ON Link is not started.
BL OFF ----
OFF ON No data addressed to the station. Or unable to receive data addressed to the station
due to noise interference. (Missing parts of the data sent from the master)
OFF OFF Unable to receive data due to wire breakdown
ON
ON
OFF OFF
OFF ON
OFF OFF
OFF ON/OFF Faulty Baud Rate and/or Station Address setting
OFF
OFF OFF Power input removed. Or power supply failure.
OFF = OFF, ON = ON, BL = Blinking
*1. SD LED may look not blinking but ON with high baud rate and fewer connected modules.
*2. LEDs indicated with “----” in STATUS rarely occurs in normal operation. (LED failure or the like as possible cause).
■ DISCRETE I/O STATUS INDICATOR LED
Discrete I/O modules, including those for extensions, have LED indicators showing I/O signal status.
Totalized pulse modules have LED indicators showing input signal status.
Contact ON : LED ON
Contact OFF : LED OFF
DATA CONVERSION
I 0 – 100% DATA CONVERSION
Analog input data is converted into digital representations of 0 – 100% proportional to each scaled range. The converted %
values are multiplied by 100 and expressed in 16 bits.
Overrange input is possible from -15 to +115% of the nominal range. When the signal exceeds the limit, the data is fixed at
-15% or +115% respectively. Negative value is represented in 2ʼs complements.
• Input Range 0 – 5 V DC
Converted Data, Decimal
Converted Data, Hex
Input Value
≤ -0.75 V
0 V
Input %
-15%
0%
-1500
0
FA24
0
10000
11500
5 V
100%
115%
2710
2CEC
≥ 5.75 V
11500 (2CEC)
10000 (2710)
-0.75
0
-1500 (FA24)
5.0
5.75
(V)
Analog output is converted in the reverse order of the input data. The output range 0 – 5 V DC is expressed as 10000 at
5.0 V (100%) and 0 at 0 V (0%).
R7C SPECIFICATIONS
ES-7801 Rev.26 Page 6/46
http://www.m-system.co.jp/