GE MDP User Manual

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6
MDP Digital Time Overcurrent Relay GE Power Management
7 MODBUS PROTOCOL GEK-100682D
7
7.5 COIL COMMANDS
7.6 EVENT HANDLING
All asynchronous events are logged by the MDP. The most recent N (to be specified) events per device are
available. The Concentrator stores the latest 24 events, this number was decided upon based on memory and
timing constraints. Eleven registers are associated with each event. Events are stored in event registers in
chronological order, EVENT 1 being the oldest event and EVENT n being the latest one. If there are more
events than can be stored in the register map the oldest event is removed from the register map and rest of the
event registers are shifted freeing the last set of event registers for the latest event.
'Number of active Events' indicates the unpolled events by the master. When there are no more unpolled
events, the number of active events will be set to 0. The 'Number of active Events' register is stored at address
1000 in dynamic value registers.
Event registers are automatically cleared after the host reads them. Partially read events are not cleared. The
number of Active Events register reflects unread events. If host does not read all the existing events, events
registers are shifted to represent remaining events to be read by host.
The host may read event registers starting at any event register set boundary. Events registers following the
event that was read will be shifted up. Events registers before the registers that are read will not be affected.
Host requests to read event registers partially (e.g. only Event Code register) will be returned with an exception
code.
Each status/event message is time stamped. Events will be stored in the same format for all devices. Event
code register value 0 implies that there is no event in that register. One global event code table is maintained
for all commnet devices. The event registers are shown in addresses 2000 to 2263 of the memory map.
3019 Phase Time Dial 0.5 to 10 (5 A relay)
0.05 to 1.0 (1 A relay)
RO Float 2 80/73/04h
3021 Phase IOC Delay 0 to 1.55 sec. RO Float 2 80/73/04h
3023 Phase TOC pickup 1.5 to 13.12 A (5 A)
0.3 to 2.625 A (1 A)
RO Float 2 80/73/05h
3025 Phase IOC pickup 0 to 31 x TOC RO Float 2 0/73/05h
Table 7–2: COMMAND REGISTES (READ COIL STATUS)
COIL
NUMBER
CONTENTS MODBUS USAGE COMMNET
COMMAND
0 Reset an event Force ON (FFOO) to reset the event 80/58h
1 Trip breaker Force ON (FFOO) to trip the breaker 52h
2 Close breaker Force ON (FFOO) to close the breaker 53h
Table 7–1: MODBUS MEMORY MAP (Sheet 4 of 4)
REGISTER CONTENTS RANGE TYPE
R/W
FORMAT CODE BYTES COMMNET
COMMAND
Courtesy of NationalSwitchgear.com

GE MDP Specifications

General

Brand	GE
Model	MDP
Category	Relays
Language	English