Parker PAC, Installation Manual, Page: 103 / 197

a good earth connection to the PAC, which can be accomplished by attaching the DIN rail to a suitable
Earth ground and also utilizing Pin-3 on the Controller DC power input connector. This connection must
be made with the shortest possible, heavy gage wire or braided cable. Low-resistance (<0.5 ohms)
continuity should be verified with an ohmmeter for proper grounding. In addition, all communication
cables should be shielded and grounded, preferably only on one end.
Status LEDs
The LED labeled "EtherCAT" indicates the state of the EtherCAT ASIC. The LED labeled "IO" indicates the
state of the Module inputs and outputs.
State LED Flash Code Explanation
Init Red, on Initializing, no data exchange
Pre-Op Red/green, 1:1 Pre-operational, no data exchange
Safe-Op Red/green, 5:1 Safe operation, inputs readable
Op Green, on Operational, unrestricted data exchange
State LED Flash Code Explanation
Ok Green, on No error
Error
Off
Malfunction of Module if E-Bus LED = On
Inoperative if E-bus LED = Off
Red, 4x EtherCAT watchdog control
Red, 6x Module-specific fault
Red, 7x
Configuration error (E-Bus pre-operational), number of process data
differs from that in the Module
Defective Red, on Module defective
State LED Flash Code Explanation
On Green, on Channel enabled
Off Off Channel disabled
Error Red Short circuit, Broken wire
Analog Inputs
Check the following variable for the digitized input values.
Variable Data type Explanation
Channel_n INT
Default in 1/10 °C