Analog I/O modules feature user-selectable voltage or current inputs, backplane isolation, removable terminal blocks, and diagnostic feedback. The 1746-NI4, 1746-NIO4I, and 1746-NIO4V input channels are filtered to reject high frequency noise and provide 14- to 16-bit (range-dependent) resolution. All 4-channel analog output modules provide 14-bit resolution and a 2.5 ms conversion rate. The 1746-FIO4I and 1746-FIO4V modules have less input filtering and can sense more rapidly changing inputs. However, their input resolution is only 12-bit. Because the input filter on the 1746-FIO4I or 1746-FIO4V module may pass more electrical noise, you should thoroughly ground and shield the input transducer, its power supply, and cables.
SLC 500 Thermocouple/mV Input Modules
All modules interface to thermocouple types J, K, T, E, R, S, B, and N, and also accept millivolt signals that standard analog modules are not able to detect. The 1746-INT4 module also interfaces with thermocouple types C and D. All modules provide fully-integrated cold-junction compensation (CJC) to retain thermocouple input signal accuracy, a choice of input filter frequencies, as well as fault diagnostics and status LEDs. Note: Block transfers are required in a remote I/O configuration, using a 1747-ASB module with a PLC
Thermocouple Module Specifications
500V dc transient between inputs and chassis ground, and between inputs and backplane. 2V dc continuous between channels (series B or later)500V dc transient between inputs and chassis ground, and 1000V dc transient or 150V ac between inputs and backplane. continuous channel-to-channel 12.5V dc continuous betweenor channel-to-backplane.The module update time is calculated by summing all the enabled Channel Sampling Times plus the CJC Update Time.
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