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Master Unit Specifications Section 2-1
2-1 Master Unit Specifications
2-1-1 Specifications
Item Specification
Model CS1W-CRM21 CJ1W-CRM21
Applicable PLC CS Series CJ Series
Unit classification CS-series Special I/O Unit CJ-series Special I/O Unit
Current consumption (Power sup-
plied from PLC’s Power Supply Unit)
400 mA max. at 5 VDC 400 mA max. at 5 VDC
Weight 190 g max. (Master Unit only) 130g max. (Master Unit only)
Communications power supply con-
nector
When a Round Cable II, Flat Cable I, or Flat Cable II cable is used, 1 communica-
tions power supply connector must be provided for Slave Units or Repeater Units
on the trunk line.
Note The Master Unit does not require a communications power supply.
Allowable current capacity for a com-
munications power supply connector
5 A max (UL rating: 4A)
If your devices must conform to the UL Standard, the allowable current capacity is
4 A max.
Maximum number of mountable
Master Units
One word number assigned: 80 Units
Two word numbers assigned: 48 Units
Four word numbers assigned: 24 Units
Eight word numbers assigned: 12 Units
One word number assigned: 40 Units
Two word numbers assigned: 40 Units
Four word numbers assigned: 24 Units
Eight word numbers assigned: 12 Units
Mounting location According to CS/CJ-series Special I/O Unit specifications.
Communications power ON/OFF
monitoring
The ON/OFF status of the communications power supply can be detected at the
communications power supply connector.
Data stored in Master Unit (built-in
EEPROM)
1) The following device parameters:
• Registration Table
• Registration Table Check Type
• Registered Slave Unit Participation Monitoring Time, Registered Slave Unit Par-
ticipation Standby Mode, and Event Disable Setting
• Software Settings Table
• I/O Communications Start Mode
• Communications Error Input Data Zero Clear Mode
• Network settings
2) Part of error history (depends on type of error; mainly serious error related to
communications stopping)
Noise immunity Conforms to IEC 61000-4-4 2kV (applied to PLC power supply)
Vibration resistance Same as general PLC specifications.
Shock resistance Same as general PLC specifications.
Dielectric strength 500 VAC (between isolated circuits)
Insulation resistance 20 MΩ min. (between isolated circuits)
Ambient operating temperature 0 to 55°C
Ambient operating humidity 10% to 90% (with no condensation)
Ambient operating atmosphere No corrosive gases
Storage humidity −20 to 75°C
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