User guide

Hardware
890 USE 108 00 August 2001 15
The E984-275 CPU with two Modbus communication ports and a Modbus Plus
network interface, 1 Meg FLASH RAM based system executive, 512K SRAM,
16K words of user memory, 32K words-State RAM, 48K words total, 128K words
of configurable SDA 6X registers, 25Mhz CPU operation, and PCMCIA release
2.1 type II socket supported.
The E984-285 CPU with two Modbus communication ports and a Modbus Plus
network interface, 1Meg FLASH RAM based system executive, 1024K SRAM,
32K words of user memory, 64K words-State RAM, 96K words total, 128K words
of configurable SDA 6X registers, 25Mhz CPU operation, PCMCIA release 2.1
type II socket supported and operating temperature -40 ... +70 degrees C.
Performance Five Compact A984 models (A984-120/130, A984-131/141, and A984-145) solve
logic at the rate of 4.25 ... 6 ms/K nodes of standard ladder logic.
Four Compact E984 models (E984-241/251, E984-245/255) solve logic at the
rate of 2.13 ... 3 ms/K nodes of standard ladder logic.
Four Compact E984 models (E984-258/265/275/285) solve logic at the rate of 0.2
... 0.6 ms/K for 1K of binary ladder logic.
Note: E984-258/265/275/285 models are available with conformal coating. The
conformal coating models are E984-258C, E984-265C, E984-275C, and E984-
285C.
Note: The E984-258C meets Railway standard EN 50 155 because it has yellow
LEDs, extended operating temperature, conformal coating and is capable of
operation with no battery in addition to other requirements.