30
A ‘1’ in any terminal position indicates the relay is energized. Term 4 indicates the state of K1 relay,
located in the MEP500 series programmers.
It is suggested that repeated polling interval not be less than 200 mSec per request.
Requesting data such as burner minutes, system minutes and burner cycles be kept
at a minimum due to the amount of processing time required to gather that data.
Logstat represents the current software module the Flame-Monitor is currently executing. They are
named as close to the logic module the actual burner sequence is in. For instance, in the Flame-Mon-
itor, MPURGE represents High Fire Purge where MPOSTPURGE represents low fire start purge.
MSHUTDWN1 represents the post purge period after a complete cycle or the cool down period after
a lockout.
MIDLE or STANDBY is the period of time where the operating control is open or the control is in
lockout waiting for reset. On instances of false flame during the purge period, the control algorithm
forces the control back to STANDBY until false flame ceases or lockout occurs.
MPREPURGE1 is the period of time prior to PURGE where the control checks the status of the air
flow interlocks or in the case of the Flame-Monitor, high fire proving switch (D-8). If found open, the
control will remain in this state until the respective switch closes or lockout occurs.
MTFI represents the pilot ignition stage of a burner sequence. MTFMF represents the main trial for
ignition period where main fuel is introduced along with pilot.
MAUTO is the run period of the burner sequence.
MPOSTIDLE and MSHTDWN2 are small periods of time where certain internal tests are conducted
and general cleanup before and after a cycle is performed.
PROGTYP is represented by 1 data word. The upper byte identifies the family and the lower byte
represents the programmer type within the family. The data represented by PROGTYP can be used to
guard against the wrong programmer being installed in a system.
Table 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
