Honeywell HA40 technical manual Analog Setup Menu, Horn / Acknowledge Menu

2.3.4 Analog Setup Menu

The system ANALOG SETUP menu allows setting the 12-bit A/D (analog to digital) counts and the 10-bit D/A (digital to analog) counts for each of the four channels. The live A/D counts value for the channel selected is also shown on the bottom of this screen.

The default setting for A/D counts is 800 for Min and 4000 for Max. This is based upon a 0-20mA input providing 0-4000 counts, or, 200 counts per mA input.

•A/D Min / Max Raw counts menu entries define the input counts value that cause Zero and Span readings as described in Input Measurement Range. The default settings for each channel are 800 to 4000 counts because the HA40 4-20mA input PCB has a 12-bit analog to digital converter that yields 200 counts per milliamp input. Standard 4-20mA inputs yield 800 counts at 4mA and 4000 counts at 20mA. However, if a special application required the Zero reading at 6mA input and the Span reading at 18mA input the correct A/D Min / Max Raw counts menu entries would become 1200 to 3600.00.

•D/A Min / Max Raw counts menu options define the optional (future) 4-20mA output PCB’s input. Ideally, 200 to 1000 yields a 4-20mA output but very slight modifications may be needed to provide precise 4mA and 20mA values for each channel.

2.3.5 Horn / Acknowledge Menu

J2 on the motherboard (shown in Figure 3.2) is the driver output for part # 1000-1892 optional 100dB piezo. Fault, Alarm1, Alarm 2, & Alarm 3 menu options (shown in Figure 2-12) allow programming of which alarms affect this piezo and whether by pulse or steady tones. The HA40 display PCB is also equipped with a small audible piezo that chirps when keys are pressed, providing an audible feedback to the operator. It also may be set to audibly indicate alarm conditions by entering ON into the Local Piezo menu item in Figure 2-12. This piezo will then mimic the optional 100dB horn.