ABB SPNPM22 Bailey network processing module

Description

SPNPM22 Each channel can be configured as either active or inactive. If a channel is inactive, it is still

sampled from the A/D. The filtering, scaling, calibration, and alarm checks are omitted for that

channel, and a value of 0 is returned to the BIU. The reference parameter for the analog input data

returns the byte length and is independent SPNPM22 of the number of active channels.

If a channel is active, and the configured analog input data length is not long enough to

accommodate the data for a particular channel, the data for that channel is still processed, since the

response to a group command may be used to transmit that channel’s data to the BIU.

SPNPM22 Each input channel can have a low alarm limit and a high alarm limit. If an input reaches one of its

limits, the module reports the actual value and sends the appropriate diagnostic bit in the BIU’s

discrete input (I) table. Alarms do not stop the process or change the value of the input. Alarm

limits can be set anywhere over the dynamic range of the signal. The range for each is -32,768 to

+32,767. The high alarm limit must be greater than the low alarm limit. If alarm reporting is not

wanted, alarm limits can be set beyond the dynamic SPNPM22 range of the signal so they will never be

activated.

Cold Junction Compensation

SPNPM22 The Thermocouple module provides four methods of Cold Junction Compensation.

No Cold Junction Compensation: This is used for millivolt inputs or if cold junction is

maintained at 0 degrees C.

SPNPM22 Remote Cold Junction Compensation: With this option, cold junction is measured externally

and provided to the module by the BIU, using its %AQ output references. Regardless of which

channel or channels use remote compensation, the compensation value must appear in the first

analog output entry. This one value is used for all SPNPM22 remotely-compensated thermocouples

attached to the module. The value is in hundredths of a degree.

SPNPM22 Fixed Cold Junction Compensation: This option uses a fixed compensation value which is

provided as part of the module configuration.

Local Cold Junction Compensation: The best way to provide local compensation is with a

Thermocouple Terminal Block. (IC670CHS004), which has two built-in thermistors. It shields

thermocouple connections from module heat.

SPNPM22 If local compensation is selected and a Thermocouple Terminal Block is not used, separate

thermistors must be installed directly at the I/O Terminal Block, using the Thermistor (+) and

Thermistor (-) terminals. The thermistor must be BetaTHERM part # 8.5K3A4 (or equivalent)

from BetaTHERM Corp., 910 Turnpike Rd., Shrewsbury MA, 01545 (ph: 508 842-0516,

FAX: 508 842-0748) Note: If local compensation is selected but a Thermocouple Terminal

Block or local thermistors are not used, erroneous temperatures may be reported.

Range Selection

The module can be configured for any of six different millivolt ranges (+/-): 19.5mV, 39mV,

78.125mV, 156.25mV, 312.5mV, and 625mV. All but the last provide input readings in hundredths

of millivolts. For the 625mV range, inputs are in tenths of millivolts.

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