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APPENDIX A-4: M200EH/EM Signal I/O Definitions, Revision F.0 Model 200EH/EM (Ref: 05147F)
A-20
SIGNAL NAME
BIT OR CHANNEL
NUMBER
DESCRIPTION
7 Spare
A status outputs, U24, J1017, pins 1–8 = bits 0–7, default I/O address 323 hex
ST_SYSTEM_OK 0 0 = system OK
1 = any alarm condition
ST_CONC_VALID 1 0 = conc. valid
1 = hold off or other conditions
ST_HIGH_RANGE 2 0 = high auto-range in use
1 = low auto-range
ST_ZERO_CAL 3 0 = in zero calibration
1 = not in zero
ST_SPAN_CAL 4 0 = in span calibration
1 = not in span
ST_DIAG_MODE 5
0 = in diagnostic mode
1 = not in diagnostic mode
ST_LOW_SPAN_CAL 6 0 = in low span calibration
1 = not in low span
ST_O2_CAL
1
7 0 = in O
2
calibration mode
1 = in NO
X
calibration mode
B status outputs, U27, J1018, pins 1–8 = bits 0–7, default I/O address 324 hex
0–7 Spare
Front panel I
2
C keyboard, default I
2
C address 4E hex
MAINT_MODE 5 (input) 0 = maintenance mode
1 = normal mode
LANG2_SELECT 6 (input) 0 = select second language
1 = select first language (English)
SAMPLE_LED 8 (output) 0 = sample LED on
1 = off
CAL_LED 9 (output) 0 = cal. LED on
1 = off
FAULT_LED 10 (output) 0 = fault LED on
1 = off
AUDIBLE_BEEPER 14 (output) 0 = beeper on (for diagnostic testing only)
1 = off
Relay board digital output (PCF8575), default I
2
C address 44 hex
RELAY_WATCHDOG 0
Alternate between 0 and 1 at least every 5 seconds to keep
relay board active
RCELL_HEATER 1 0 = reaction cell heater on
1 = off
CONV_HEATER 2 0 = converter heater on
1 = off
MANIFOLD_HEATER 3 0 = bypass or dilution manifold heater on
1 = off
IZS_HEATER 4 0 = IZS heater on
1 = off
04521C (DCN5731)