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Below is a table of currently available messages provided by the MicroM programmers, followed by
a description where necessary.

Messages 00, 05, 08, 10, 15, 21 and 26 are unique in that a limited number of successive registers
can be combined with these requests. For example, a request to message 00 can contain up to 6 data
words. The response to this would contain STATUS, MSGN, GSTAT, TIMER, FLAME and
LOGSTAT. If the requested data word count (DAT) were to be 2 then the response would contain
STATUS and MSGN only. Message 15, last 6 lockouts, can return data ranging from 1 to 6, with 1
referring to the most recent lockout.

Message 26 returns the current operating status as well as stored burner hours and burner cycles as a
snapshot of the entire MicroM system. When all 9 words are requested, the data returned consists of
STATUS, MSGN, FLAME, INPUTS, OUTPUTS, BNRMINS, and BNRCYCS. 

MESSAGE
ADDRESS

WORDS

REQUESTED

RESPONSE

VALUE

00

1-6

STATUS

83 (053H) = RUN;

202 (0CAH) = LOCKOUT

01

1

MSGN

Current message being displayed (see Table 3)

02

1

GSTAT

Defines Timer Type

03

1

TIMER

Time, Flame, Address

04

1

FLAME

Flame Signal

05

1-3

LOGSTAT

Current logic module, PURGE, PTFI, AUTO 

06

1

INPUTS

Input limits state

07

1

OUTPUTS

Output relays state

08

2, 4 or 8

SYSMINS

System on minutes

10

2 or 4

BNRMINS

Burner on minutes

12

2

CYCLES

Completed Burner Cycles

14

1

LOCKOUT COUNT

Stored Lockout Count

15

1-6

LOCKOUT HISTORY

Last 6 Lockouts, first word is most current lock-

out

21

1-2

DEVTYP

Programmer device type, 5=EP, 6=EPD, 

7=MicroM

22

1

AMPTYP

Amplifier Type; 

MECD=080H;
MEUV=090H;

MEIR=0A0H;

MERT=0B0H;

MEUVS=0C0H

23

1

PROGTYP

Programmer Type

24

2

FLAME SIGNAL 

AVERAGES

PTFI and Auto Flame Signal Averages

26

1-9

Combined Status

See Description Below

35

6

Most Recent Lockout Data

Returns complete lockout description of stored 

lockout history. Includes lockout message, 

lockout module, @ burner hours, and @ burner 

cycles

41

6

2nd Most Recent Lockout 

Data

47

6

3rd Most Recent Lockout 

Data

53

6

4th Most Recent Lockout 

Data

59

6

5th Most Recent Lockout 

Data

65

6

6th Most Recent Lockout 

Data

Summary of Contents for MicroM Series

Page 1: ...on of the current operating status as well as diagnostic history To maximize safety the MEP696 provides early spark termination followed by a pilot prov ing period This prevents the unwanted detection of spark generated by a maladjusted pilot and spark assembly The air flow switch connected between terminals 7 and 6 must be closed within 10 seconds after the start of a cycle Below is a detailed li...

Page 2: ...F 40qC Photocell 45CM1 165qF 74qC 40qF 40qC Flame Rod Tip 2460 F 1500qF 816qC 40qF 40qC 48PT2 125qF 52qC 40qF 40qC CSIA5 140qF 60qC 40qF 40qC COMBINATION NUMBER PILOT FUEL TERMINAL 3 IGNITION TERMINAL 4 MAIN VALVE TERMINAL 5 1 C NO LOAD E 2 B NO LOAD E 3 NO LOAD NO LOAD E 4 E A E 5 NO LOAD A E 6 D A E 7 D A D 8 NO LOAD A D A B C D E 4 5A Ignition 50 VA Pilot Duty plus 4 5A ignition 180 VA Ignition...

Page 3: ... CAUTION Published load ratings assume that no control be required to handle inrush current more often than once in 15 seconds The use of control switches solenoids relays etc which chatter will lead to premature failure It is important to run through a test operation with fuel shut off following the tripping of a circuit breaker a blown fuse or any instance of chattering of any external current c...

Page 4: ...ound is required to ensure that large currents involved with any surge voltages will follow the desired path in preference to alternative paths where extensive damage may occur to equipment Refer to bulletin MP 5601 for a detailed description of the MEP696 programmer Refer to bulletin MC 5000 for additional information about the MicroM product line MicroM Chassis Types Common for all controls incl...

Page 5: ...ush the module into position Insert the programmer module into the slot at the right side of the chassis and gently push the module into position WARNING Turn off the power when installing or removing the control PV MV S1 7 3 5 4 1 A S2 PILOT VALVE BLOWER MOTOR ALARM 8 120VAC 50 60Hz T P FLAME AMPLIFIER SPARK KI KF IGNITION H N 2 FLAME SCANNER OR CONTACTOR MAIN FUEL VALVE OPERATING CONTROL KA KB A...

Page 6: ... g Wick man 19373 071 K WARNING Disconnect power before servicing FIGURE 3 MEP696 Programmer Dip Switch Configuration Note C refers to switch closed position closed position is when the switch is toward the printed cir cuit board O refers to switch open position or when the switch is moved away from the printed cir cuit board Indicating arrow on top of programmer cover points toward closed positio...

Page 7: ... to open Recycle Applies to air flow interlock opening during the Run condition If the air flow interlock Terminal 6 opens the control will de energize Terminals 3 4 and 5 and if Recycle is selected a new prepurge period will begin Lockout and alarm will occur imme diately after air flow interlock opening if Non Recycle is selected LED INDICATOR LIGHTS The MEP696 Programmer Module has 5 LED lights...

Page 8: ...g the Reset push button while in the Idle or Off state LOCKOUT CODES NOT LIGHTED LIGHTED FLASHING All LED s Flashing indicates defective programmer All MicroM chassis are shipped with a convenient peel off label that can be applied to any surface inside cover for future reference MSGN DESCRIPTION OP CTRL AIRFLOW INTLCK TFI FLAME ALARM DEC HEX 6 6 Lockout Line Frequency Noise Detected 7 7 Lockout F...

Page 9: ...ace Amplifier module Amplifier Auto Check Fail Flame signal too high Use orifice in sight pipe Internal Amplifier diagnostic fault Replace Amplifier module Check Scanner Defective shutter Inspect scanner wiring replace scanner UV tube false firing Replace UV tube or scanner Check Blown Fuse No power detected on terminal 3 Inspect defective pilot valve or igniter Defective fuse Replace fuse Line Fr...

Page 10: ...ata being requested In Modbus register addresses begin at 40001 but is interpreted as address 00 DAT is the number of words being requested A word is an integer consisting of 2 bytes The normal response from a slave is as follows DBC is the data byte count being returned It must be two times the DAT number from the poll request DATA is the data returned and is always a series of 2 byte integers If...

Page 11: ... STATUS 83 053H RUN 202 0CAH LOCKOUT 01 1 MSGN Current message being displayed see Table 3 02 1 GSTAT Defines Timer Type 03 1 TIMER Time Flame Address 04 1 FLAME Flame Signal 05 1 3 LOGSTAT Current logic module PURGE PTFI AUTO 06 1 INPUTS Input limits state 07 1 OUTPUTS Output relays state 08 2 4 or 8 SYSMINS System on minutes 10 2 or 4 BNRMINS Burner on minutes 12 2 CYCLES Completed Burner Cycles...

Page 12: ...ould be ignored If GSTAT is between 4 and 7 the TIMER represents the cur rent value flame signal If GSTAT is a 1 2 or 3 then TIMER represents a running timer value The baud rate of the MicroM is fixed at 4800 bits per second The format of the data is 8 data bits no parity and 1 stop bit Due to the RS485 format the communication format is considered half duplex That is only one user is permitted on...

Page 13: ...able 1 Logic Dispatch LOGIC DISPATCHER VALUE MicroM HEX DEC 45H 69 MPOSTIDLE 46H 70 MPREPURGE1 47H 71 MPURGE 48H 72 MTFI 49H 73 MSTABLE 4AH 74 MTFMF 4BH 75 MAUTO 4CH 76 MSHTDWN1 4DH 77 MSHTDWN2 4EH 78 MIDLE ...

Page 14: ...e Table 2 Message Description DEC HEX MicroM Message 1 1 L1 7 OPEN 2 2 FALSE FLAME 3 3 STARTING BURNER 4 4 5 5 INTRLCK OPEN 6 6 LOCKOUT LINE FREQUENCY NOISE DETECTED 7 7 LOCKOUT FLAME FAIL PTFI 8 8 UNIT ADDRESS 9 9 MTFI 10 0AH IGNITION TIMING 11 0BH 12 0CH FLAME SIGNAL 13 0DH CYCLE COMPLETE 14 0EH OFF 16 10H LOCKOUT AMPLIFIER HIGH COUNT FAIL 19 13H LOCKOUT FLAME FAIL MTFI 20 14H LOCKOUT FALSE FLAM...

Page 15: ...ress counter depress and release the RESET push button and observe the LED pattern If the RESET switch is untouched for 30 seconds the current address displayed will be stored to memory and the MicroM will automatically exit the address mode TEST JACK VOLTAGE For all amplifiers the MicroM provides a uniform 0 10 volt signal to represent the flame signal strength A signal reading greater than 4 vol...

Page 16: ...otocells which is found defective in material or workmanship or which otherwise fails to conform to the description of the product on the face of its sales order THE FOREGOING IS IN LIEU OF ALL OTHER WARRANTIES AND FIREYE MAKES NO WARRANTY OF MERCHANTABILITY OR ANY OTHER WARRANTY EXPRESS OR IMPLIED Except as specifically stated in these general terms and conditions of sale remedies with respect to...

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