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With different communication interface, the I/O modules can be classified to high communication speed (Parallel bus) 8K series modules and low communication speed (serial interface) 87K series modules.
 
I-8K Series VS I-87K Series
There are two types of I/O modules, Parallel and Serial. The parallel modules (I-8K Series) are high-speed modules and support MCU (Main Control Unit) only. The serial modules (I-87K Series) can support either MCU or I/O expansion unit. The difference between the two series are:
Model I-8K Series I-87K Series
Communication interface Parallel bus Serial bus
Protocol - DCON
Communication speed Fast Slow
DI with latched function - Y
DI with counter input - Y (100 Hz)
Power on value - Y
Safe value - Y
Programmable slew-rate for AO module - Y
 
High Profile VS Low Profile
With different form factor, I/O modules can be classified to high profile and low profile. Basically, high profile and low profile modules that with same item number also have same I/O channel number.
For example: I-8054 and I-8054W both has 8 DI and 8 DO.
Except I/O channel number, other specifications could be different. You have to double check whether the specifications suit your application. For example:
For I-8054W, its DI logic high level is +10~+50V. But for I-8054, it is +3.5~+30V.
 
The support list of MCU (Main Control Unit) and I/O expansion unit are:
I-8K Series VS I-87K Series
There are two types of I/O modules, Parallel and Serial. The I-8K series modules are high-speed modules with parallel interface and the I-87K series are serial interface modules. Both they are supported on PAC (Programmable Automation Controller) units listed in the following table.
PAC Description I-8K Series I-87K Series
High Profile Low Profile High Profile Low Profile
XPAC WES/CE6 OS Y… - Y… -
WinPAC CE5 OS Y… - Y… -
LinPAC Linux OS Y… - Y… -
ViewPAC PAC with Display Y(Note) - Y(Note) -
iPAC MiniOS7 OS Y - Y -
iPPC-6731-WES7 WES PAC with 15" Touch Panel Y - Y -
MP-8000 Motion PAC Y… - - -
I-8000 MiniOS7 OS Y Y Y Y
 
I-8K Series VS I-87K Series
The high-speed I-8K series are parallel interface modules and I-87K series are serial interface modules. Both they are supported on PAC-base slave I/O unit. But only I-87K series modules are supported on expansion I/O units like I-87Kn, ET-87Pn, RU-87Pn and USB-87Pn series units.
Slave I/O unit Protocol Interface I-8K Series I-87K Series
Ethernet RS-485 High Profile Low Profile High Profile Low Profile
I-8x10 DCON - Y… Y Y… Y
I-8x30
I-8KE4/8
DCON
I-8xxx-MTCP
I-8KE4/8-MTCP
Modbus TCP Y… Y Y… Y
iP-8xxx-MTCP Modbus TCP Y… - Y… -
iP-8xxx-MRTU Modbus RTU -
ET-87P4-MTCP
ET-87P8-MTCP
Modbus TCP
Modbus RTU
- - - Y… -
ET-87P4/8 DCON
I-87K4/5/8/9 DCON - - - Y… Y
RU-87P1/2/4/8 DCON - - - Y… -
USB-87P1/2/4/8 DCON USB - - Y… -
CAN-8xx3 CANopen CAN bus Y… Y… Y… Y…
CAN-8xx4 DeviceNet - Y… Y… Y…
 
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