I/O Expansion
The main control unit provide 4 or 8 internal I/O expansion slots. An RS-485 port is provided for external I/O expansion.This RS-485 port is used to connnect to the I/O expansion units, 87K4 or 87K8. Only serial I/O modules can be installed in the I/O expansion unit. The main control module can control up to 255 serial I/O modules through one RS-485 port .

I/O Modules
There are two types of I/O modules, parallel and serial. The parallel modules are high speed modules and have to be installed in the Main Control Unit. The serial I/O modules can be installed in either the main control unit or expansion unit. There are over 40 different parallel/serial I/O modules available. These modules include D/I, D/O, A/D, D/A, Timer/Counters, motion control, encoder interfaces, Storage Flash, Battery backed-up SRAM, ASICKey and a Printer interface.
The modules can be mixed and matched to the application in either the 4 or 8-slot control unit. I/O expansion can either be achieved through an I/O expansion bus, or alternatively through connection to another controller to the network.

Parallel I/O Modules
Parallel I/O modules provide the following features

• High speed A/D: 100K samples/second
• High speed D/A: 30K from –10V to +10V
• High speed D/I & D/O
• High speed motion control module, stepping/servo
• High speed encoder module
• High performance Counter/Frequence modules
• High speed multi-channel RS-232/RS-422/RS-485 modules
• Printer interface & X-Socket interface module
• X-Socket interface module

Serial I/O modules
Serial I/O Expansion Modules
Model No Descriptions
87033 High speed A/D * 8 channels, 100K samples/second max.
87016 2 * strain gage input
87017 8 * analog input
87018 8 * thermocouple input
87022 2 * fully isolated D/A
87024 4 * D/A, common ground
87051 16 * D/I, 3.5V ~ 30V
87052 8 * isolated D/I, differential input
87053 16 * isolated D/I
87054 8 * isolated D/I + 8 * isolated D/O
87055 8 * D/I, 8 * D/O
87057 16 * isolated D/O, 100mA, 30V max.
87063 4 * isolated D/I + 4 * Relay (220V)
87064 8 * power relay
87065 8 * SSR AC
87066 8 * SSR DC
87068 8 * Relay (1A)
87082 2 * counter/frequency, 1 ~ 100K
87083 8 * counter, DC to 100K