Programmable Logic Controllers (Plc) - Black & Decker d984 Installation Manual

Programmable Logic Controllers (PLC)
The Modicon 984-381 ~t3a5~t385Dt480~~4a5~t485bu685~~785~~785~~785u
Controllers are mid-range Programmable Logic Controllers in a modular, expand-
able, architecture. They employ Modicon 800 series housings, interfaces and I/O
modules. These PLC' s are supported by the same instruction set as the other 984
models, and are programmed by Modsoft panel software. All of these units have a
built-in power supply. All of these units are fully compatible with the Modicon 984
PC instruction set, and solve user logic at a rate of from
1
ms to 2.5 ms per thou-
sand nodes of user logic. The 785El785Dl785K are 24-bit CPU' s and the rest are
16-bit CPU' s.
These units have two, or three built-in Modbus ports for data transfer and remote
programming. Through these ports, communication processing on the CPU board
links the controller to multiple supervisory and programming devices such as a
host computer or Modicon' s programming panel. The two Modbus ports allow you
to connect more than one Modbus device to the controller. Some models have
both a single Modbus port and a second port for the Modbus Plus high speed Lo-
cal Area Network. While others have two Modbus ports and one Modbus Plus
port. The DIP switch for setting the Modbus Plus port address can be accessed
through the bottom of the module' s case.
User memory is backed up by a lithium battery which has a conservatively rated
service life of one year. Once energized, the BATTERY LOW indicator will come
ON when the battery has 14 days left before it will be effectively drawn down. The
battery has a five-year shelf life.
w
Note
The 485K and 785K are the same has the 485E and 785E ex-
cept the K' s have a memory protect Key Switch on the front of the unit.
w
Note
The 385D and 785D are the same has the 385E and 785E ex-
cept the D' s operate on 125VDC rather than 115/23OVAC.
Figure 1 is a perspective view of the 381 E/385E/385D controllers. Certain physi-
cal features are noted.
2
Introducing your Controller
GWO984-EDK