Limit Devices–CN2516, CN2508 and CN2504 Product Manual
Page iii
Powering Up Procedure ............................................................................................................................. 22

Overview of Front Panel ............................................................................................................................ 22
Displays ..................................................................................................................................................... 23
Keypad ...................................................................................................................................................... 23
LED Functions ........................................................................................................................................... 23
6 Messages and Error Indications ................................................................................................... 24
7 Instrument Operation Modes ......................................................................................................... 25
Select Mode ............................................................................................................................................... 25
Entry into the Select Mode ................................................................................................................. 25
Navigating in Select Mode ................................................................................................................. 25
Unlock Codes ............................................................................................................................................ 25
Navigating in the Product Information Mode ...................................................................................... 26
Entry and Navigating in Lock Code View Mode ................................................................................. 27
8 CN2516, CN2508 & CN2504 – Model Group ................................................................................. 28
CN2516, CN2508 & CN2504 Limit Devices - Configuration Mode ............................................................. 28
Entry into the Configuration Mode ...................................................................................................... 28
Scrolling through Parameters and Values .......................................................................................... 28
Changing Parameter Values .............................................................................................................. 28
CN2516, CN2508 & CN2504 Limit Devices – Setup Mode ........................................................................ 34
Entry into the Setup Mode .................................................................................................................. 34
Scrolling through Parameters & Values ............................................................................................. 34
Changing Parameter Values .............................................................................................................. 34
CN2516, CN2508 & CN2504 Limit Devices - Operator Mode .................................................................... 36
Navigating in Operator Mode ............................................................................................................. 36
Limit Setpoint Adjustment .......................................................................................................................... 37
Exceed Condition ....................................................................................................................................... 37
Limit Output Function ................................................................................................................................. 37
Limit Annunciator Outputs .......................................................................................................................... 37
Resetting Limit Outputs & Annunciators ..................................................................................................... 37
Using the Reset Key to Reset Limit Outputs & Annunciators ............................................................ 37
Resetting Limit Hold and Exceed Time ...................................................................................................... 37
CN2516, CN2508 & CN2504 Devices – Serial Communications Parameters ............................................ 38
Bit Parameters ................................................................................................................................... 38
Word Parameters ............................................................................................................................... 38
9 Modbus Serial Communications .................................................................................................. 42
Physical Layer ........................................................................................................................................... 42
Link Layer .................................................................................................................................................. 43
Device Addressing ..................................................................................................................................... 44
Supported Modbus Functions .................................................................................................................... 44
Function Descriptions ................................................................................................................................ 44
Read Coil/Input Status (Function 01 / 02) .......................................................................................... 45