schneiderSystem Planning and Installation Guide for Model PC-E984-3811385 & PC-E984-385D

have a free port for connecting your local programming panel The second port on 

the 385E and D is for the Modbus Plus network Connection.. 

Figure 3 illustrated the controller from the left side. The MEM/DEFAULT/MODEM 

toggle switch enables your preset communications configuration for Modbus port 

1. (For software configuration, refer to software configurator in Panel software 

documentation.) 

The DIP switch for setting Modbus Plus port parameters is shown at the bottom of 

the illustration but access to the DIP switch is actually through the bottom of the 

modules ’ case. 

Central Processing Unit (CPU) Function 

The Model “E” uses 24 bit memory architecture and a 16 bit CPU which is fully 

compatible with the Modicon 984 PC instruction set, solves user logic at a nominal 

rate of 2.5 ms per thousand nodes of user logic. For special applications, a timeof-day clock is provided on all “E” Models. 

Mainframe Status Indicators 

Status indicators on the CPU module are: 

POWER OK 

READY 

RUN 

BATTERY LOW 

MODBUS Port 1 

MODBUS Port 2 

Green LED: When ON, indicates input power OK and voltage outputs OK. Your l/O power OK is indicated by the 

READY LED. 

Amber LED: When ON, indicates Controller passed powerup diagnostics. Remains ON in Stopped and Run modes 

as long as health status is OK. Indicator is OFF when an 

error condition is detected by diagnostics. 

Green LED: When ON, indicates Controller is in the RUN 

mode and solving logic. If memory checksum fails this light 

will blink 3 times for 5 seconds followed by a rest period of 

2.5 seconds then the pattern repeats. The controller is in 

Kernal mode and needs the executive reloaded. 

Red LED: When ON, indicates battery needs to be replaced (14 day holdup from initial indication). 

Green LED: When ON, indicates communication processor 

has unit address and communications are in progress. 

Green LED: When ON, indicates communication processor 

has unit address and communications are in progress. 

(The port 2 indicator is labeled MODBUS PLUS on the 385E and 385D and 

indicates status as:) 

MODBUS PLUS Green LED This LED displays a flashing repetitive pattern to indicate the node status: 

NORMAL flashes every 160 msec. 

MONITOR NETWORK flashes at one 

second intervals. Is in offline state receive only. 

NOT RECEIVING TOKEN flashes two times then is off for 

two seconds. 

SOLE STATION flashes three times then is off for 1.7 seconds. 

DUPLICATE NODE ADDRESS flashes four times then is 

off for 1.4 seconds.

Overview 

The 381 E/385E and 385D Controller is designed to work with your Modicon Modsoft programming panel; Modicon 800 series housings, interfaces and I/O modules. 

The site planner must also consider the peripheral equipment (such as a Programming panel, CRT monitor, or printer) when preparing an installation plan for 

the site. Refer to the appropriate Modicon publications for site preparation procedures for related equipment. 

Space Requirements 

For the primary module housing, allow 12 inch clearance to the left so installer can 

see power supply connectors. Allow 6 inches on the top and side of the housing 

for convection cooling in vertical mounting situations. Allow 12 inch of clearance 

at the bottom of the Controller for cable access. 

For all other housings, allow 6 inches on the top and sides of each housing for unobstructed cooling airflow in vertical mounting situations. 

Also consider installation and physical access for removal of the modules as well 

as subsequent service including the connection and detachment of signal and 

power cables when required. 

The primary housing may be separated up to 12 feet from the secondary housing 

depending only on the on the cable length employed. 

Primary Power Lines 

In addition to service access, distance to power sources has to be considered in 

planning your controller installation. In addition to cable routing considerations, 

good practices dictate that the power lines be dedicated to the PC installation to

minimize problems that sometimes arise when sharing AC power with electrically 

noisy equipment. 

Finally, plan to install a service loop and a cable restraint as the primary power 

cable as the connector is not locked in place. 

Environmental Requirements 

In planning for controller installation, consideration should be given to the environment around the controller. Although designed for a harsh industrial environment 

and able to withstand factors that would harm other types of electronic equipment, 

problems can be avoided by not placing the controller and its related equipment in 

an operating area where there is high ambient temperature, acidic atmosphere, vibration, dust, and dirt if it can be avoided. 

Mounting Hardware Requirements 

After deciding on the final location of the Controller, its associated equipment and